( 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 .
Bus passengers were Chinese nationals , officials say . The dead lay in body bags on the roadway near the overturned bus . Tour bus overturns on U.S. Route 93 , heading from Arizona to Las Vegas . Hospital says Five victims being flown to Las Vegas .