Motive and opportunity.
No answers yet on motive, and it may be a while before we know much about the why of what took place. A mass shooting at a grocery store in Bend, Oregon left two shoppers dead and the gunmen killed, although those circumstances aren’t yet clear either:
It sounds as though the shooter killed himself, but that’s still not yet confirmed. Police say that they didn’t fire any shots themselves. If that’s the case, then the shooter either killed himself or someone else inside the store was armed and shot him. Police have also dismissed reports of an accomplice, so if it was someone else, it was someone who was defending himself and others.