(Portland, OR) -- Police are searching for a teenager accused of assaulting a woman during her run through a southeast Portland neighborhood. Police say the woman was out running Monday night when the teen ran up behind her and slapped her on the behind. Police say the teen hit her so hard that it left a welt. The woman says the boy was about 15-years-old and is five-feet-ten-inches with a husky build and shaggy brown hair. The teen reportedly got out of a white van just before the attack.