CHESTER, Pa. (CBS) - Two counts of murder have been filed against a 16-year-old from Chester, Pa. who will be tried as an adult for last weekend’s shootings at a birthday party that left two people dead and seven others wounded.

Kenai Avery left a party at the Minaret Temple with a gun in his hand and was subsequently tackled by a security guard there (see previous story).  He gave Chetser police a couple of different explanations about that weapon, according to investigators.

“The defendant indicated initially that he was at the party when shots were fired, he saw the gun on the floor, picked it up, and ran outside the building where he was apprehended,” says Delaware County DA Mike Green. “He later stated that the gun was placed in his hand by the security guard and then he was apprehended by that guard.”

Avery’s cell phone contained three photos of a weapon similar to the gun in his hand.

There was a second weapon found inside the hall near where Robel Laboy and David Johnson were shot.  That gun had been fired that night, but no one is sure by whom.

Reported by David Madden, KYW Newsradio 1060