Four detained after Mattapan street is shot up early this morning

Live Boston reports somebody in a pickup with three other guys seems to have gone down Hiawatha Road in Mattapan firing a gun repeatedly, around 4:30 p.m. Officers found casings on Hiawatha and then, after they found the pickup and the four guys on Blue Hill Avenue, found "multiple spent shell casings" in both the pickup's cab and bed. Nobody hit.