Three US service members were killed by small arms fire in two separate clashes in Iraq, the military said Tuesday. One death occurred in Mosul, 360 kilometers northwest of Baghdad, when a soldier was shot early Tuesday morning, the military said. It provided no other details and said the incident was under investigation. On Monday, two U.S. Marines died when they were hit by small-arms fire as U.S. forces fought insurgents near the town of Rutba, 370 kilometers (230 miles) west of Baghdad, the military said. Four militants were killed and a small supply of their arms seized, the statement said. The Marines were assigned to Regimental Combat Team 2, 2nd Marine Division, II Marine Expeditionary Force (Forward). The names of the three deceased were being withheld pending notification of their relatives. At least 1,979 members of the US military have died since the beginning of the Iraq war in March 2003, according to an Associated Press count.