A U.S. Marine Corps helicopter was declared missing on Tuesday with six Marines and two Nepalese soldiers aboard as it was ferrying rice and tarps to earthquake victims in rugged terrain in Nepal, near a town hard hit by the latest deadly aftershocks.

Army Col. Steve Warren, a Pentagon spokesman, said reports from the field indicated the helicopter's crew was overheard talking about fuel problems before U.S. military officials lost contact with the light attack helicopter.

A 90-minute search by three Marine Corps V-22 tilt-rotor aircraft failed to locate the aircraft before nightfall and the air search was suspended. A ground search by Nepalese troops was continuing, Warren said.