⁍ The Philadelphia Police Department said on Tuesday it was investigating the killing of a Black man they say was armed with a knife.

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⁍ The shooting involving two officers sparked sometimes violent protests in the U.S. city overnight.

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⁍ Thirty officers were injured on Monday evening as police faced off with protesters.

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– Protesters took to the streets of Philadelphia overnight after police shot and killed a 27-year-old black man who they say was armed with a knife. Thirty officers were injured in the unrest that followed the Monday night shooting of Walter Wallace Jr., Reuters reports. Police say they shot Wallace after he refused to drop the knife. Video of the shooting shows Wallace walking toward two officers with the knife in his hand. “I recognize that the video of the incident raises many questions,” Philadelphia Police Commissioner Danielle Outlaw says. “Residents have my assurance that those questions will be fully addressed by the investigation.” Police say that after Wallace refused to drop the knife, one of the officers opened fire, the Philadelphia Inquirer reports. Wallace was pronounced dead at the scene. The American Civil Liberties Union and other groups are calling for an investigation. “It is time to divest in police and invest in community programs, including the kind of mental health services that allow intervention that may have prevented Mr. Wallace’s killing,” says the executive director of the Pennsylvania ACLU.