At least one police officer was run over by a truck in Philadelphia as protesters stormed the streets Monday night in response to a fatal police shooting earlier in the day.

The officer who was struck can be seen in footage on social media as a black truck swerves into a group of officers lined across the street to protect against oncoming demonstrators, the Philadelphia Inquirer reported.

The condition of the officer was not immediately clear.

The unruly demonstrations erupted over the death of Walter Wallace, who was shot by police after refusing to drop a knife at about 4 p.m.