Arizona ? A tour bus overturned on a highway near the Hoover Dam on Friday, killing seven Chinese nationals and injuring at least 10 others, the Arizona Department of Public Safety said.

Six fatalities were confirmed at the scene, about 190 miles northwest of Phoenix; a seventh person died at a Las Vegas hospital, said Cmdr. Dean Nyhart with DPS.

Nyhart said the bus was traveling north on U.S. 93 when it veered left and then right across the median. It rolled at least once before stopping.

He believes all but one of the victims killed at the scene had been ejected from the bus.

Nyhart said five people had suffered life-threatening injuries. “We’re hopeful that those people can be stabilized and at least the death toll stop where it is,” he said.

The driver of the bus was among those in critical condition, he said.