The FBI on Monday afternoon investigated a bomb threat involving a bus in San Juan County.
The threat closed U.S. Highway 163 south of Mexican Hat.
Utah Department of Public Safety spokesman Dwayne Baird said the threat involved a tour bus that was 14 miles north of the Arizona line in Utah's Monument Valley, on Indian reservation land.
Utah Department of Transportation spokesman Kevin Kitchen said the roadway was closed as a precaution about 2 p.m. while the FBI investigated.
Everyone was evacuated safely from the bus.
Kitchen said traffic between the Arizona border and Bluff was rerouted to U.S. Highway 191, a parallel route to the east of Highway 163.
Baird said Monday night that the road would stay closed through the night as the threat was investigated. A bomb squad from the Utah County Sheriff's Office was called in to help Monday afternoon, he said.