Sgt. Sean McGowan said police were dispatched with lights and sirens on the report of three men and a woman forcing their way into a Connecticut Avenue apartment early Saturday afternoon. The victim told police he covered his face and head as best he could, but was struck in the head, the back and midsection by the metal tool. Police also found the hammer used in the attack lying on the ground and seized it for a possible DNA identification, McGowan said.