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PITTSBURGH (KDKA) — The Allegheny County District Attorney says he believes Pittsburgh Police are withholding evidence in a case involving undercover officers involved in a bar brawl.

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DA Stephen Zappala says police did not hand over all of the surveillance video of the incident until Thursday, two weeks after the fight between the officers and members of a motorcycle club at a bar on the South Side.

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He says he’s still waiting for body cam video from uniformed officers.

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Zappala says the undercover officers were drinking at the bar before the fight, and he isn’t sure they were actually on-duty.

“I don’t know that they’re undercover. I don’t know why they’re in the bar. We haven’t heard from the supervisor that they were on duty. We haven’t heard from the supervisor who the target was, if there was – in fact – a target,” Zappala said.

Four members of Pagan Motorcycle club were arrested and charged.

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Zappala’s concerns about the fight led him to meet with the U.S. Attorney to determine if there’s a civil rights violation involved.