UPDATE 4:47 PM: KATU is live-streaming online right here. Portland police officers are holding a press conference. They say the shooter has been "neutralized" and can't comment on how many people were injured. There will be another briefing at 5:30 pm.
UPDATE 5:35 PM: Portland Police confirms that two people are dead. There was only one shooter, and he is dead, for a total of three dead. Police are searching the mall for hidden and injured people.