A truck carrying military explosives overturned on Interstate 20 just outside this west Texas town, and police closed the highway and briefly ordered evacuations before learning the explosives were not armed.

Local authorities said the truck carried 48 rocket pods containing 644 M-77 grenades and a quantity of rocket fuel, but there was no explosion and no fire.Military authorities ordered helicopters flown to Sweetwater from bases in Texas and Oklahoma to remove the explosives, said Police Chief Jim Kelly.

An evacuation order was issued for all residents within 3,000 feet of the accident scene, but the order was later lifted after an investigator entered the truck and determined the explosives were not armed, said Texas Department of Public Safety spokesman Mike Cox.