I too believe he has something in the jacket, likely the right pocket. It might be a gun, but if so, I don't believe he actually used it for anything other than intimidation. Someone would've heard a gunshot in that area at that time of day. And on that thought - I believe the murders were committed fairly close to where the bodies were found, because if he'd taken them to another location, it would risky for the perp(s) to return to the area where he took the girls - especially when people could have been out looking for them.