At least three people have died and four others are injured after a helicopter carrying tourists in Arizona went down in the Grand Canyon, authorities have said.
The incident took place at around 5.20pm local time in Grand Canyon West, located in northwestern Arizona, said Hualapai Nation police chief Francis Bradley.
Local media reported the Eurocopter EC130 helicopter, whose operator was unknown, was traveling on a tour.
"The investigation is ongoing," Mr Bradley said, noting that there was no information immediately available on the circumstances surrounding the tragedy.
Allen Kenitzer, of the Federal Aviation Authority's Office of Communications, said the aircraft sustained "substantial damage".
The FAA and the National Transportation Safety Board will investigate the crash, he added.
