(Salem, OR) -- Oregon Attorney General Dan Rayfield is launching a formal investigation into yesterday's shooting of two people by Customs and Border Protection agents in Portland. Rayfield says the investigation will look into whether any federal officer acted outside the scope of their lawful authority and will include witness interviews, video evidence, and other relevant materials. Last year, Rayfield and three district attorneys sent a letter to Homeland Security warning they were monitoring the actions of federal agents and documented several incidents where federal officers used disproportionate force.