3 killed in shooting incident at Washington mall, gunman's location unknown
Police were actively searching for the shooter, who had posted a photo of rescue workers outside of the mall.
Medics wait to gain access to the Cascade Mall after four people were shot dead in Burlington, Washington, U.S. September 24, 2016.(photo credit: REUTERS/ SGT MARK FRANCIS/WASHINGTON STATE PATROL)ByREUTERSUpdated: