A double row of chain-link fencing circles the Arizona State Capitol. Windows on the Illinois and Ohio statehouses have been boarded up. National Guard troops in camouflage and flak jackets and heavily armed state troopers were stationed at state capitals across the U.S. in advance of protests planned for Sunday.

With the FBI warning of potential for violence at all state capitols, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.

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Members of the Washington National Guard stand at a sundial near the Legislative Building, Sunday, Jan. 10, 2021, at the Capitol in Olympia, Wash. Governors in some states have called out the National Guard, declared states of emergency and closed their capitols over concerns about potentially violent protests. (AP PhotoTed S. Warren)

A double row of chain-link fencing circles the Arizona State Capitol. Windows on the Illinois and Ohio statehouses have been boarded up. National Guard troops in camouflage and flak jackets and heavily armed state troopers were stationed at state capitals across the U.S. in advance of protests planned for Sunday.

A temporary six-foot high chain link fence surrounds the state Capitol because of concerns over the potential for civil unrest, in Sacramento, Calif., Thursday, Jan. 14, 2021.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.    (AP PhotoRich Pedroncelli)

They are trying to avoid a repeat of the mob rioting that occurred Jan. 6, when supporters of outgoing President Donald Trump stormed the U.S. Capitol, leaving a Capitol Police officer and four others dead.

A Capitol police officer stands at the front entrance of the Pennsylvania Capitol building Tuesday Jan. 12, 2021,  in Harrisburg, Pa. State capitols across the country are under heightened security after the siege of the U.S. Capitol last week. (AP PhotoJacqueline Larma)

SWAT officers stood guard at the Georgia State Capitol. A bomb-detecting dog sniffed its way through the capitol in Jackson, Mississippi. State troopers were poised on the roof of the Ohio Statehouse in Columbus. Sections of temporary fencing that encircled many state capitols were locked together in Sacramento with handcuffs.

Deputy State Fire Marshal Kayla Riggs follows the agency's explosive detection dog, "Ringo," as he walks down the steps of the third floor at the Capitol in Jackson, Miss., Thursday, Jan. 14, 2021. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.  (AP PhotoRogelio V. Solis)

Deputy State Fire Marshal Kayla Riggs follows the agency's explosive detection dog, "Ringo," as he walks down the steps of the third floor at the Capitol in Jackson, Miss., Thursday, Jan. 14, 2021. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoRogelio V. Solis)

A DPS state trooper stands guard at the Capitol on the first day of the 87th Legislature, Tuesday Jan. 12, 2021 in Austin, Texas. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (Ricardo B. BrazziellAustin American-Statesman via AP)

A DPS state trooper stands guard at the Capitol on the first day of the 87th Legislature, Tuesday Jan. 12, 2021 in Austin, Texas. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (Ricardo B. BrazziellAustin American-Statesman via AP)

A Georgia State Patrol trooper stands guard outside the Georgia Capitol Friday, Jan. 15, 2021, in Atlanta. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.    (AP PhotoJohn Bazemore)

A Georgia State Patrol trooper stands guard outside the Georgia Capitol Friday, Jan. 15, 2021, in Atlanta. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoJohn Bazemore)

Handcuffs are used to secure two sections of temporary six-foot high chain link fence surrounding the state Capitol because of concerns over the potential for civil unrest, in Sacramento, Calif., Friday, Jan. 15 2021.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.  (AP PhotoRich Pedroncelli)

Handcuffs are used to secure two sections of temporary six-foot high chain link fence surrounding the state Capitol because of concerns over the potential for civil unrest, in Sacramento, Calif., Friday, Jan. 15 2021. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoRich Pedroncelli)

A Georgia State Patrol S.W.A.T. team member stands guard outside the Georgia State Capitol building Thursday, Jan. 14, 2021, in Atlanta.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (AP PhotoJohn Bazemore)

A Georgia State Patrol S.W.A.T. team member stands guard outside the Georgia State Capitol building Thursday, Jan. 14, 2021, in Atlanta. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoJohn Bazemore)

Two layers of security fencing is shown encircling the Arizona Capitol Saturday, Jan. 16, 2021, in Phoenix.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (AP PhotoRoss D. Franklin)

Two layers of security fencing is shown encircling the Arizona Capitol Saturday, Jan. 16, 2021, in Phoenix. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoRoss D. Franklin)

Workers maneuver sheets of plywood into place as they work to cover the first floor windows at the Illinois State Capitol in preparations for possible protests, Friday, Jan. 15, 2021, in Springfield, Ill.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.    (Justin L. FowlerThe State Journal-Register via AP)

Workers maneuver sheets of plywood into place as they work to cover the first floor windows at the Illinois State Capitol in preparations for possible protests, Friday, Jan. 15, 2021, in Springfield, Ill. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (Justin L. FowlerThe State Journal-Register via AP)

Ohio Statehouse maintenance employees board up the windows of the building behind the United Spanish War Veterans Memorial statue in preparation for planned weekend protests in Columbus, Ohio, on Thursday, Jan. 14, 2021.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (Adam CairnsThe Columbus Dispatch via AP)

Ohio Statehouse maintenance employees board up the windows of the building behind the United Spanish War Veterans Memorial statue in preparation for planned weekend protests in Columbus, Ohio, on Thursday, Jan. 14, 2021. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (Adam CairnsThe Columbus Dispatch via AP)

Two Ohio State Highway Patrol troopers look out from the Ohio Statehouse roof Wednesday, Jan. 13, 2021 in Columbus. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (Doral ChenowethThe Columbus Dispatch via AP)

Two Ohio State Highway Patrol troopers look out from the Ohio Statehouse roof Wednesday, Jan. 13, 2021 in Columbus. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (Doral ChenowethThe Columbus Dispatch via AP)

Michigan State Police officers patrol outside the state Capitol in Lansing, Mich., Friday, Jan. 15, 2021.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (AP PhotoCarlos Osorio)

Michigan State Police officers patrol outside the state Capitol in Lansing, Mich., Friday, Jan. 15, 2021. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoCarlos Osorio)

Fencing stands around the base where a Civil War monument once stood outside the west steps of Colorado's State Capitol as security measures are put in place to protect against any breaches during weekend protests planned outside the building Friday, Jan. 15, 2021, in Denver.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.  (AP PhotoDavid Zalubowski)

Fencing stands around the base where a Civil War monument once stood outside the west steps of Colorado's State Capitol as security measures are put in place to protect against any breaches during weekend protests planned outside the building Friday, Jan. 15, 2021, in Denver. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoDavid Zalubowski)

Workers install fencing around Lansing City Hall, Friday, Jan. 15, 2021, in Lansing, Mich., in preparation of potential protests ahead of President-elect Joe Biden's inauguration. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (Matthew Dae SmithLansing State Journal via AP)

Workers install fencing around Lansing City Hall, Friday, Jan. 15, 2021, in Lansing, Mich., in preparation of potential protests ahead of President-elect Joe Biden's inauguration. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (Matthew Dae SmithLansing State Journal via AP)

A man carries a U.S. flag past National Guard members standing behind a perimeter fence, Sunday, Jan. 10, 2021, at the Capitol in Olympia, Wash.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (AP PhotoTed S. Warren)

A man carries a U.S. flag past National Guard members standing behind a perimeter fence, Sunday, Jan. 10, 2021, at the Capitol in Olympia, Wash. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoTed S. Warren)

Governors have declared states of emergency, closed capitols to the public and called up troops ahead of President-elect Joe Biden’s inauguration next week.

Members of the Washington National Guard stand at a sundial near the Legislative Building, Sunday, Jan. 10, 2021, at the Capitol in Olympia, Wash. Governors in some states have called out the National Guard, declared states of emergency and closed their capitols over concerns about potentially violent protests. (AP PhotoTed S. Warren)

Members of the Washington National Guard stand at a sundial near the Legislative Building, Sunday, Jan. 10, 2021, at the Capitol in Olympia, Wash. Governors in some states have called out the National Guard, declared states of emergency and closed their capitols over concerns about potentially violent protests. (AP PhotoTed S. Warren)

They are trying to avoid a repeat of the mob rioting that occurred Jan. 6, when supporters of outgoing President Donald Trump stormed the U.S. Capitol, leaving a Capitol Police officer and four others dead.

Details were vague, but demonstrations were expected at state capitols beginning Sunday and leading up to Biden taking the oath of the office Wednesday.

Signs of ramped-up security were in abundance from Atlanta to Sacramento, California, throughout the week.

A temporary six-foot high chain link fence surrounds the state Capitol because of concerns over the potential for civil unrest, in Sacramento, Calif., Thursday, Jan. 14, 2021.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.    (AP PhotoRich Pedroncelli)

A temporary six-foot high chain link fence surrounds the state Capitol because of concerns over the potential for civil unrest, in Sacramento, Calif., Thursday, Jan. 14, 2021. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoRich Pedroncelli)

SWAT officers stood guard at the Georgia State Capitol. A bomb-detecting dog sniffed its way through the capitol in Jackson, Mississippi. State troopers were poised on the roof of the Ohio Statehouse in Columbus. Sections of temporary fencing that encircled many state capitols were locked together in Sacramento with handcuffs.

National Guard troops patrolled the California Capitol and streets of downtown Sacramento on Saturday.

A Capitol police officer stands at the front entrance of the Pennsylvania Capitol building Tuesday Jan. 12, 2021,  in Harrisburg, Pa. State capitols across the country are under heightened security after the siege of the U.S. Capitol last week. (AP PhotoJacqueline Larma)

A Capitol police officer stands at the front entrance of the Pennsylvania Capitol building Tuesday Jan. 12, 2021, in Harrisburg, Pa. State capitols across the country are under heightened security after the siege of the U.S. Capitol last week. (AP PhotoJacqueline Larma)

Deputy State Fire Marshal Kayla Riggs follows the agency's explosive detection dog, "Ringo," as he walks down the steps of the third floor at the Capitol in Jackson, Miss., Thursday, Jan. 14, 2021. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.  (AP PhotoRogelio V. Solis)

Deputy State Fire Marshal Kayla Riggs follows the agency's explosive detection dog, "Ringo," as he walks down the steps of the third floor at the Capitol in Jackson, Miss., Thursday, Jan. 14, 2021. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoRogelio V. Solis)

A DPS state trooper stands guard at the Capitol on the first day of the 87th Legislature, Tuesday Jan. 12, 2021 in Austin, Texas. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (Ricardo B. BrazziellAustin American-Statesman via AP)

A DPS state trooper stands guard at the Capitol on the first day of the 87th Legislature, Tuesday Jan. 12, 2021 in Austin, Texas. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (Ricardo B. BrazziellAustin American-Statesman via AP)

A Georgia State Patrol trooper stands guard outside the Georgia Capitol Friday, Jan. 15, 2021, in Atlanta. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.    (AP PhotoJohn Bazemore)

A Georgia State Patrol trooper stands guard outside the Georgia Capitol Friday, Jan. 15, 2021, in Atlanta. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoJohn Bazemore)

Handcuffs are used to secure two sections of temporary six-foot high chain link fence surrounding the state Capitol because of concerns over the potential for civil unrest, in Sacramento, Calif., Friday, Jan. 15 2021.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.  (AP PhotoRich Pedroncelli)

Handcuffs are used to secure two sections of temporary six-foot high chain link fence surrounding the state Capitol because of concerns over the potential for civil unrest, in Sacramento, Calif., Friday, Jan. 15 2021. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoRich Pedroncelli)

A Georgia State Patrol S.W.A.T. team member stands guard outside the Georgia State Capitol building Thursday, Jan. 14, 2021, in Atlanta.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (AP PhotoJohn Bazemore)

A Georgia State Patrol S.W.A.T. team member stands guard outside the Georgia State Capitol building Thursday, Jan. 14, 2021, in Atlanta. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoJohn Bazemore)

Two layers of security fencing is shown encircling the Arizona Capitol Saturday, Jan. 16, 2021, in Phoenix.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (AP PhotoRoss D. Franklin)

Two layers of security fencing is shown encircling the Arizona Capitol Saturday, Jan. 16, 2021, in Phoenix. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoRoss D. Franklin)

Workers maneuver sheets of plywood into place as they work to cover the first floor windows at the Illinois State Capitol in preparations for possible protests, Friday, Jan. 15, 2021, in Springfield, Ill.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.    (Justin L. FowlerThe State Journal-Register via AP)

Workers maneuver sheets of plywood into place as they work to cover the first floor windows at the Illinois State Capitol in preparations for possible protests, Friday, Jan. 15, 2021, in Springfield, Ill. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (Justin L. FowlerThe State Journal-Register via AP)

Ohio Statehouse maintenance employees board up the windows of the building behind the United Spanish War Veterans Memorial statue in preparation for planned weekend protests in Columbus, Ohio, on Thursday, Jan. 14, 2021.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (Adam CairnsThe Columbus Dispatch via AP)

Ohio Statehouse maintenance employees board up the windows of the building behind the United Spanish War Veterans Memorial statue in preparation for planned weekend protests in Columbus, Ohio, on Thursday, Jan. 14, 2021. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (Adam CairnsThe Columbus Dispatch via AP)

Two Ohio State Highway Patrol troopers look out from the Ohio Statehouse roof Wednesday, Jan. 13, 2021 in Columbus. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (Doral ChenowethThe Columbus Dispatch via AP)

Two Ohio State Highway Patrol troopers look out from the Ohio Statehouse roof Wednesday, Jan. 13, 2021 in Columbus. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (Doral ChenowethThe Columbus Dispatch via AP)

Michigan State Police officers patrol outside the state Capitol in Lansing, Mich., Friday, Jan. 15, 2021.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (AP PhotoCarlos Osorio)

Michigan State Police officers patrol outside the state Capitol in Lansing, Mich., Friday, Jan. 15, 2021. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoCarlos Osorio)

Fencing stands around the base where a Civil War monument once stood outside the west steps of Colorado's State Capitol as security measures are put in place to protect against any breaches during weekend protests planned outside the building Friday, Jan. 15, 2021, in Denver.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.  (AP PhotoDavid Zalubowski)

Fencing stands around the base where a Civil War monument once stood outside the west steps of Colorado's State Capitol as security measures are put in place to protect against any breaches during weekend protests planned outside the building Friday, Jan. 15, 2021, in Denver. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoDavid Zalubowski)

Workers install fencing around Lansing City Hall, Friday, Jan. 15, 2021, in Lansing, Mich., in preparation of potential protests ahead of President-elect Joe Biden's inauguration. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (Matthew Dae SmithLansing State Journal via AP)

Workers install fencing around Lansing City Hall, Friday, Jan. 15, 2021, in Lansing, Mich., in preparation of potential protests ahead of President-elect Joe Biden's inauguration. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (Matthew Dae SmithLansing State Journal via AP)

A man carries a U.S. flag past National Guard members standing behind a perimeter fence, Sunday, Jan. 10, 2021, at the Capitol in Olympia, Wash.  With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries.   (AP PhotoTed S. Warren)

A man carries a U.S. flag past National Guard members standing behind a perimeter fence, Sunday, Jan. 10, 2021, at the Capitol in Olympia, Wash. With the FBI warning of potential violence at all state capitols Sunday, Jan. 17, the ornate halls of government and symbols of democracy looked more like heavily guarded U.S. embassies in war-torn countries. (AP PhotoTed S. Warren)