A police car with broken windows is seen in a photograph released by the Milwaukee Police Department after disturbances following the police shooting of a man in Milwaukee, Wisconsin, U.S. August 13, 2016.

Protesters fired gunshots, hurled bricks and set a gas station on fire in Milwaukee on Saturday night, hours after a patrol officer shot and killed an armed suspect who took flight after a traffic stop, authorities said.

The 23-year-old suspect, who had a lengthy arrest record, was carrying a stolen handgun loaded with 23 rounds of ammunition when police pulled over the vehicle for "suspicious activity," authorities said. A second suspect who fled from the vehicle was quickly taken into custody.