Not even the shooter, if he's the second suspect now reported to be released after questioning.
Look _really_ closely at the rifle especially near the end of the clip as it's being carried and you can see the underside. The scale is a bit off for a high power centerfire one, it looks to me like a barrel cocking air rifle. That especially based on my interpretation of the forward end of the stock, you cock the spring by pulling the barrel down thus what looks more like a mechanism than the smooth wood you'd expect there.
