Authorities said the cause of the crash, which occurred on State Route 12, was under investigation.
State Highway Patrol and Garfield County Sheriff’s Department officials said weather did not appear to be a factor in the crash.
Thirty people, including the driver, were on board the bus when it swerved across the road and back, before rolling over against a guard rail and coming to rest upright, authorities said. Footage from the scene showed the vehicle’s roof crushed in on top of the passenger compartment.
The 26 survivors were taken to various hospitals with injuries ranging from minor to life-threatening, Utah Highway Patrol spokesman Corporal Chris Bishop said. At least five people were critically injured, he added.
All 29 passengers on the bus were citizens of mainland China, and the driver was Chinese-American, Bishop said. The driver survived the crash, but his condition was not immediately known.
Because nearly all the victims spoke only Mandarin, communication proved a challenge to authorities, who called for volunteers to help as translators at hospitals where the injured were taken.
The Chinese Embassy in Washington said on Twitter that it was sending diplomatic personnel to the area to further assist the victims.
(Production: Pavithra George)