Clackamas County Sheriff's spokesman Lieutenant James Rhodes said the shopping centre remained closed while it was searched following the shooting.
More top news
Parliamentary inquiry finds thousands of children could fall prey to sexual exploitation and gangs because of flawed warning systems.
David Cameron said the June 23 referendum is the most important vote young people will place in their lifetimes.
Plan would leave steelworkers worse off in retirement - but not as worse off as those in other pension schemes.