Bologna pictured during protests earlier this week. PHILADELPHIA - A Philadelphia officer faces aggravated assault charges after video surfaced of him striking a student protester in the head with a metal baton, District Attorney Larry Krasner said Friday night.Police Staff Inspector Joseph Bologna also has been charged with reckless endangerment and possession of an instrument of crime.Police Commissioner Danielle Outlaw had said earlier Friday that the officer had been taken off street duty during the investigation.Video circulating widely on Twitter shows Bologna hitting a 21-year-old Temple University student in the head and neck area with a baton, before the student is knocked to the ground and another officer put his knee on him to.