Hundreds of protesters are defying an emergency decree to confront police in Chile's capital, continuing disturbances that have left at least 11 dead and led the president to say the country is "at war."

Police used tear gas and streams of water to break up protests on one of Santiago's main streets Monday.

Meanwhile, many people lined up before supermarkets that had reopened. Many were still closed after a weekend that saw scores of stores looted or burned.

A man leaves with his groceries as military police stand guard outside a supermarket in Santiago, Chile, Monday, Oct. 21, 2019. Chile's capital seemed to return to calm Monday after three days of protests and acts of vandalism sparked by a rise in subway fares. (AP PhotoLuis Hidalgo)

A man leaves with his groceries as military police stand guard outside a supermarket in Santiago, Chile, Monday, Oct. 21, 2019. Chile's capital seemed to return to calm Monday after three days of protests and acts of vandalism sparked by a rise in subway fares. (AP PhotoLuis Hidalgo)

Only one of the city's six subway lines was operating because rioters had burned or damaged many of the stations.

President Sebastián Piñera said Sunday that the country is "at war with a powerful, relentless enemy that respects nothing or anyone and is willing to use violence and crime without any limits."

A military police stands guard at a supermarket as customers wait in line, in Santiago, Chile, on Monday, Oct. 21, 2019. Chile's capital seemed to return to calm Monday after three days of protests and acts of vandalism sparked by a rise in subway fares. (AP PhotoLuis Hidalgo)

A military police stands guard at a supermarket as customers wait in line, in Santiago, Chile, on Monday, Oct. 21, 2019. Chile's capital seemed to return to calm Monday after three days of protests and acts of vandalism sparked by a rise in subway fares. (AP PhotoLuis Hidalgo)

Military police stand guard at a supermarket as customers are pay for their groceries, in Santiago, Chile, on Monday, Oct. 21, 2019. Chile's capital seemed to return to calm Monday after three days of protests and acts of vandalism sparked by a rise in subway fares. (AP PhotoLuis Hidalgo)

Military police stand guard at a supermarket as customers are pay for their groceries, in Santiago, Chile, on Monday, Oct. 21, 2019. Chile's capital seemed to return to calm Monday after three days of protests and acts of vandalism sparked by a rise in subway fares. (AP PhotoLuis Hidalgo)