Philadelphia has imposed a city-wide curfew starting Wednesday at 9 p.m. to try to prevent a third night of looting and violence amid widespread protests over the police killing of a Black man.

Iran PressAmerica: The curfew will run through Thursday at 6 a.m., Philadelphia Mayor Jim Kenney and other officials told a briefing.

According to Reuters, Tension has gripped the streets of Philadelphia since Monday’s deadly police shooting of Walter Wallace, 27, who was armed with a knife and described by relatives as suffering from a mental breakdown, in a confrontation with law enforcement.

Philadelphia police have made 172 arrests and 53 officers have been injured in two nights of protests that were marked by significant looting of big-box stores and other businesses, some of which were still recovering from unrest in the summer.

City officials said as many as 1,000 people were involved in looting in one corner of the city on Tuesday night, catching the police force off guard.

"These individuals are doing nothing but simply wasting our precious resources," Philadelphia Police Commissioner Danielle Outlaw said at the briefing, lamenting what she described as "widespread lawlessness" in Pennsylvania’s biggest city.

The unrest has turned Philadelphia into the latest flashpoint in the United States on issues of race and police use of force just days ahead of Tuesday’s presidential election.

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