(CNN) -- A bus carrying Chinese tourists overturned Friday near Hoover Dam, killing at least seven people and injuring at least nine, an Arizona Department of Public Safety spokesman said.



Authorities work on the crash scene Friday on U.S. 93 in White Hills, Arizona, near Hoover Dam.



The accident happened at 4 p.m. on U.S. 93 at mile marker 27, about 27 miles south of Hoover Dam, said Lt. James Warriner.



The dead lay in body bags on the roadway near the bus, which was on its side across both lanes and onto the shoulder of the highway.



Initial reports from the scene indicated rescuers had difficulty communicating with the passengers, all of them Chinese nationals.



Five of the injured were taken to Kingman Regional Medical Center, where one was in critical condition and four were in serious condition, said Ryan Kennedy, executive director of operations.



Rick Plummer, a spokesman for University Medical Center in Las Vegas, said the hospital received five victims by helicopter, one who died, two in critical condition and two in serious condition.  Watch authorities work the crash scene »



The north-south highway at the crash scene in White Hills, Arizona, was shut in both directions. Officials said the bus was heading from Las Vegas to Arizona. Hoover Dam is near the border of the two states.  View a map of the crash site »



Among the injured was a motorcyclist who was hurt avoiding the bus, said National Park Service spokesman Andrew Munoz.
What highway did the bus overturn at? Where were many of the victims being flown? The tour bus overturns where? Who was flown to Las Vegas? What country were the passengers on the bus from? The dead lay where? Where did the bus overturn? Bus passengers were from what country? As many as how many victims are being flown to Vegas? What foreign nationality were several of the passengers? Who were bus passengers?
U.S. 93 Kingman Regional Medical Center, near Hoover Dam, five victims Chinese in body bags on the roadway near the bus, White Hills, Arizona, near Hoover Dam. Chinese nationals. five Chinese nationals. Chinese tourists
question: What highway did the bus overturn at?, answer: U.S. 93 | question: Where were many of the victims being flown?, answer: Kingman Regional Medical Center, | question: The tour bus overturns where?, answer: near Hoover Dam, | question: Who was flown to Las Vegas?, answer: five victims | question: What country were the passengers on the bus from?, answer: Chinese | question: The dead lay where?, answer: in body bags on the roadway near the bus, | question: Where did the bus overturn?, answer: White Hills, Arizona, near Hoover Dam. | question: Bus passengers were from what country?, answer: Chinese nationals. | question: As many as how many victims are being flown to Vegas?, answer: five | question: What foreign nationality were several of the passengers?, answer: Chinese nationals. | question: Who were bus passengers?, answer: Chinese tourists