A truck carrying a rocket booster for an unarmed Minuteman III intercontinental ballistic missile tipped over on a northwestern North Dakota road on Thursday, but no one was injured and there was no threat to the public, an Air Force official said.

The transport rig crashed on a gravel road at about 8 a.m. Thursday near Makoti about 70 miles from Minot Air Force Base, from where it departed, the Air Force said.

“There was no weapon present and no danger to the public,” said Maj. Gen. Roger Burg, an Air Force spokesman.

The truck was traveling from the air base to a launch facility in northwestern North Dakota, he said.

“It rolled on its side and into a ditch,” Burg said. “It was preparing to turn, and it appears the wheels got off the edge of the roadway.

Two airmen in the vehicle were not seriously injured, he said.

The booster rocket, which is 66 feet long and weighs 75,000 pounds, was being hauled in an enclosed trailer, and a convoy of security personnel was escorting the truck, Burg said.

The booster rocket and the transport rig likely will remain in the ditch at least until Friday, he said.

Burg said there have been three or four similar accidents in the past 25 to 30 years.

Earlier this month, three ballistic missile crew members from the Minot base fell asleep while holding classified launch code devices. The Air Force said the missile launch codes were outdated and remained secure at all times. But that came after other missteps, including an incident last August in which a B-52 bomber that was mistakenly armed with six nuclear warheads flew from the Minot base to Louisiana.

In May, the Minot Air Force Base’s 5th Bomb Wing, which was blamed for the foul-up, came up short in a nuclear weapons handling inspection. It will have to be retested.