Philadelphia's police have released bodycam footage "in the spirit of transparency" of the moment when the 27-year-old African-American man named Walter Wallace Jr was shot dead by police in late-October.
The disturbing footage shows Wallace Jr holding a blade and approaching the police officers through the parked cars. The officers are shouting at him, ordering him to put down the knife.
A woman is seen running towards Wallace Jr in an attempt to stop him. Moments later, several gunshots are heard, Wallace Jr drops to the ground, and the woman starts screaming "You killed my son!” as she throws something towards the officers.
The killing of Wallace Jr has led to mass riots with several hundred members of the Pennsylvania National Guard being sent to Philadelphia to help local police subdue the civil unrest.