IN EASTERN SAUDI ARABIA (AP) _ A U.S. Marine died of an apparent heart attack after physical training, and six U.S. soldiers were hurt when their helicopter made a forced landing, the U.S. Military Command said Sunday.

The Marine, assigned to the 2nd Marine Division's headquarters battalion, collapsed and died Friday, the command said. He was the 98th American service member to have died since Operation Desert Shield began Aug. 7.

The identity of the Marine was withheld until next of kin could be notified.

The helicopter, a CH-47 Chinook from the 101st Airborne Division, was carrying a crew of five and 13 soldiers on a training mission Friday when it caught fire and was forced to make an emergency landing, the command said.

Six of the 18 service personnel on board were evacuated with minor injuries, while the others were treated at the scene, the command said.

It was not immediately clear what caused the fire, which destroyed the helicopter and a 105 millimeter howitzer and HUMVEE utility vehicle it was carrying, the command said.