(Vancouver, WA)  --  Vancouver police say they've arrested two teenagers after they were accused of beating a man and stealing his car.  A third teen is still at large.  Police say the 50-year-old man was severely assaulted yesterday evening in the parking lot of the Motel 6 on Northeast Chkalov [[ CHEK-uh-lovv ]] Drive, after which his car was stolen and later was found wrecked in the area of Northeast 124th Avenue and Northeast 8th Street in Vancouver.  Police say the two teens arrested are 15 and 16 years of age, but the third suspect hasn't been found.  The victim's injuries aren't considered life-threatening.