Gunmen shot and killed two South Korean electricians and wounded two others near Saddam Hussein's hometown of Tikrit (search), South Korea's Foreign Ministry said Sunday.

In Baghdad, the U.S. military said a Colombian civilian working as a contractor for the military was killed Saturday in an ambush on a convoy. It was not immediately clear if he died in the same attack as the South Koreans.

The South Koreans were shot while riding in a passenger car apparently en route to Tikrit, north of Baghdad, Foreign Ministry Director General Lee Kwang-jae said. He could not say when the shooting occurred.

The victims were electricians for a firm contracted by a U.S. company to lay power lines at an electricity transmission station near Tikrit. Lee said officials from South Korea's embassy in Iraq were on their way to the scene.

Seoul's acting ambassador to Iraq, Son Se-ju, also was quoted by Yonhap as saying the two had been staying at a motel in Baghdad (search) and were probably on their way to Tikrit.

U.S. Army Brig. Gen. Mark Kimmitt said at a news briefing in Baghdad that the Colombian citizen died when insurgents opened fire with small arms on a convoy near the town of Balad, 45 miles north of Baghdad.

The Colombian was an employee of the U.S. defense contractor Kellogg Brown & Root (search), a subsidiary of Halliburton Co., the company previously headed by Vice President Dick Cheney, the military said.

In Tikrit, a U.S. Army spokesman said an attack on a convoy Sunday afternoon left three people dead. The incident occurred near Samara (search), south of Tikrit, said Sgt. Robert Cargie, spokesman for the 4th Infantry Division.