The incident took place during the unrest in Fishtown on June 1, where Krasner says Ehrens was filming a group of men who were gathered with bats, pipes and other items during a confrontation with Black Lives Matter protesters outside of the 26th Police District.
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“This was basically an attack by a small mob of people,” Krasner said.
Graf, 36, has been charged with conspiracy, aggravated assault, reckless endangerment and other related charges.
Krasner says Graf has a criminal record, including a conviction on assault charges from Philadelphia and Bucks County.
His office is investigating several complaints from that day.