PORTLAND, OR -- Police in Portland, Oregon are looking for a motive behind a mall shooting that left three people dead, including the shooter. The shooting happened Tuesday afternoon at the Clackamas Town Center.

Several eyewitnesses told local TV stations that suspect was wearing a hockey mask and was running through the mall just before the shots were fired. Hundreds of people were evacuated following the shooting, after locking themselves in store offices. Another person was hurt and was taken to the hospital.