ApotheosisMMC.
Jedi Council Member
For what it's worth, the image is from a video that appeared on the same day of the incident, although in this other photo you can see how they are removing the weapon from the dead shooter's hands:The first question to ask is: at what time was this photo taken? Police were on the roof soon after the shooting. We don't know if this was the original position of the weapon.
Here is another video from an aerial view of the roof:
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