A police officer and multiple other people were killed in a furious gunbattle Tuesday that filled the streets of Jersey City with the sound of heavy gunfire for about an hour, authorities said.

Authorities said they believe the bloodshed was not an act of terrorism, but it was still under investigation.

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First responders and law enforcement personnel stand near the scene following a shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  AP PhotoEduardo Munoz Alvarez)

A police officer and multiple other people were killed in a furious gunbattle Tuesday that filled the streets of Jersey City with the sound of heavy gunfire for about an hour, authorities said.

Law enforcement arrive on the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  (AP PhotoSeth Wenig)

One officer was pronounced dead at a hospital, and multiple other people were found dead at a kosher supermarket, Mayor Steven Fulop said without specifying how many were killed. A second officer was struck in the shoulder by gunfire, and two other officers were hit by shrapnel, Fulop said.

Bystanders look out from a store as law enforcement arrives at the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J. AP PhotoEduardo Munoz Alvarez)

SWAT teams, state police and federal agents converged on the scene, and police blocked off the area, which in addition to the school and supermarket included a hair salon and other shops. Dozens of bystanders pressed against the police barrier to capture the action on their cellphones, some whooping when bursts of fire could be heard.

Law enforcement gathers near the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  AP PhotoEduardo Munoz Alvarez)

Law enforcement gathers near the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J. AP PhotoEduardo Munoz Alvarez)

Law enforcement gathers near the scene following a shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  AP PhotoEduardo Munoz Alvarez)

Law enforcement gathers near the scene following a shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J. AP PhotoEduardo Munoz Alvarez)

Law enforcement arrive on the scene following reports of shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  (AP PhotoSeth Wenig)

Law enforcement arrive on the scene following reports of shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J. (AP PhotoSeth Wenig)

Bystanders look on as law enforcement arrive on the scene following reports of shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  (AP PhotoSeth Wenig)

Bystanders look on as law enforcement arrive on the scene following reports of shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J. (AP PhotoSeth Wenig)

New York City Police officers arrive on the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  (AP PhotoSeth Wenig)

New York City Police officers arrive on the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J. (AP PhotoSeth Wenig)

Port Authority Police officers arrive at the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  (AP PhotoSeth Wenig)

Port Authority Police officers arrive at the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J. (AP PhotoSeth Wenig)

Officials gave no immediate details on what set off the shooting and how it unfolded, and there was no word on how many suspects were involved or whether anyone had been taken into custody.

First responders and law enforcement personnel stand near the scene following a shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  AP PhotoEduardo Munoz Alvarez)

First responders and law enforcement personnel stand near the scene following a shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J. AP PhotoEduardo Munoz Alvarez)

One officer was pronounced dead at a hospital, and multiple other people were found dead at a kosher supermarket, Mayor Steven Fulop said without specifying how many were killed. A second officer was struck in the shoulder by gunfire, and two other officers were hit by shrapnel, Fulop said.

The bullets started flying early in the afternoon in the city of about 270,000 people, situated across the Hudson River from the Statue of Liberty.

The shooting spread fear through the neighborhood, and the nearby Sacred Heart School was put on lockdown as a precaution.

Law enforcement arrive on the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  (AP PhotoSeth Wenig)

Law enforcement arrive on the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J. (AP PhotoSeth Wenig)

SWAT teams, state police and federal agents converged on the scene, and police blocked off the area, which in addition to the school and supermarket included a hair salon and other shops. Dozens of bystanders pressed against the police barrier to capture the action on their cellphones, some whooping when bursts of fire could be heard.

Video shot by residents recorded loud volleys of gunfire reverberating along one of the city's main streets and showed a long line of law enforcement officers pointing guns as they advanced, yelling to bystanders, “Clear the street! Get out of the way!”

“ It's like firecrackers going off," said Andy Patel, who works at a liquor store about three blocks away. "They were shooting like crazy. ... The cops were clearing everyone off the streets.”

Bystanders look out from a store as law enforcement arrives at the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J. AP PhotoEduardo Munoz Alvarez)

Bystanders look out from a store as law enforcement arrives at the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J. AP PhotoEduardo Munoz Alvarez)

Law enforcement gathers near the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  AP PhotoEduardo Munoz Alvarez)

Law enforcement gathers near the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J. AP PhotoEduardo Munoz Alvarez)

Law enforcement gathers near the scene following a shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  AP PhotoEduardo Munoz Alvarez)

Law enforcement gathers near the scene following a shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J. AP PhotoEduardo Munoz Alvarez)

Law enforcement arrive on the scene following reports of shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  (AP PhotoSeth Wenig)

Law enforcement arrive on the scene following reports of shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J. (AP PhotoSeth Wenig)

Bystanders look on as law enforcement arrive on the scene following reports of shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  (AP PhotoSeth Wenig)

Bystanders look on as law enforcement arrive on the scene following reports of shooting, Tuesday, Dec. 10, 2019, in Jersey City, N.J. (AP PhotoSeth Wenig)

New York City Police officers arrive on the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  (AP PhotoSeth Wenig)

New York City Police officers arrive on the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J. (AP PhotoSeth Wenig)

Port Authority Police officers arrive at the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J.  (AP PhotoSeth Wenig)

Port Authority Police officers arrive at the scene following reports of gunfire, Tuesday, Dec. 10, 2019, in Jersey City, N.J. (AP PhotoSeth Wenig)