Transcript for Chaos erupts with demonstrators in Philadelphia after armed man shot by police
We go to Philadelphia now where demonstrators took to the streets overnight after police shot and killed a man armed with a knife. Eva pilgrim has the story. Reporter: Overnight hundreds taking to the streets of Philadelphia outraged over the death of Walter Wallace Jr. The 27-year-old man armed with a knife shot by police Monday afternoon. People covering the streets as fireworks and other projectiles explode in the air surround a police car engulfed in flames. Lines clearly drawn at times, the crowd forcing cruisers back in the streets. 30 officers injured over the course of the night. This video shows a pickup plowing into an officer. That officer currently in stable condition. At least 33 people were arrested. Police say officers were responding to a domestic call when they encountered Wallace, allegedly armed with knife. This video shows two officers on the scene. They repeatedly ask Wallace, the man in all black here to put the knife down as he continues making his way towards them before they open fire. Two discharging officer, any injuries to ? No injuries to police. The man was shot in the chest. Reporter: He was transported to the hospital where he later died. Emotions in the neighborhood running high. Residents say there were better options. They could have used a taser and shot him in the leg. Why was the fact that first thing them officers did was pull their weapon on that man. Reporter: The Philadelphia police commissioner on the scene to hear their frustrations saying the video of the shooting raises questions that need answering. I'm here to listen. I don't have any answers for what happened today. It just happened. Reporter: And that unrest overnight not over. This video from Philadelphia showing looting still happening just minutes ago and that shooting, it is under investigation. Those two officers that were involved, they have been placed on desk duty pending the outcome of that investigation. All right, Eva, thank you.
This transcript has been automatically generated and may not be 100% accurate.