(Oak Grove, OR) -- The Clackamas County Sheriff's Office believes there might be other victims of a man who was arrested for rape. Jacob Koser allegedly met the victim on the dating app Tinder. He may have used another app called Pure. He's charged with multiple counts of rape, strangulation, and assault. He's also accused of giving alcohol to someone under 21 or an intoxicated person and delivering marijuana. He's being held on half-a-million dollars bond.