PHILADELPHIA (AP) -- Philadelphia prosecutors have concluded that a gun owned by Indianapolis Colts star Marvin Harrison was used in an April shooting, but they still can't determine who pulled the trigger.

Philadelphia District Attorney Lynne Abraham on Tuesday announced that five bullet casings found at the North Philadelphia shooting scene came from Harrison's handgun. But investigators have conflicting witness accounts of who fired it.

No charges have been filed in the April 28 shooting, but Abraham says the investigation continues. The victim has sued Harrison, saying he was seriously injured.

The All-Pro wide receiver is originally from Philadelphia. He has played 12 seasons with the Colts and is the franchise's record-holder in every major receiving category.