Local media report that a flagrant rule-breaker, who carried his concealed weapon into Clackamas Town Center Mall despite signs declaring it a gun-free zone, may have prompted the kid doing the shooting to toss his jammed weapon and run.
KGW's video takes a bit of time to get going, from reports. I'm unsure where the problem is, there.
Links to this have been sent from several downstream sources by several folks, including Jeff and Sam, anon, and others, and have been authenticated at the source. Thanks to all.