(Aloha, OR)  --  Four suspects are facing charges in connection with an attack on a man with a rubber mallet in Aloha.  Washington County sheriff's deputies say 20-year-old Mohamed Abukar, two 16-year-old males, and one 17-year-old male are accused of attacking the 39-year-old victim while he was walking his dog early yesterday morning.  Authorities say the man bought them beer as they requested and was returning with it when the attack began, and he was left with non-life-threatening injuries.  Two other suspects in the attack are still at large.