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LAS VEGAS – Seven people were injured Tuesday when a Grand Canyon tour helicopter made a hard landing at a Nevada airport, authorities said.

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The helicopter was returning from a tour of the Grand Canyon with six passengers and a pilot aboard the aircraft, KLAS-TV reported. According to a statement from officials in Boulder City, the helicopter made a hard landing at Boulder City airport.

It was unclear why the aircraft made a hard landing, officials said.

The 25-minute flight originated at the Grand Canyon near Kingman, Arizona, and was headed for the Boulder City airport, according to The Associated Press.

Officials with the Boulder City Fire Department responded to the landing, KVVU-TV reported. Officials determined that all seven people suffered injuries that were not considered to be life-threatening, according to the television station.

They were taken to area hospitals for treatment.

The National Transportation Safety Board will handle the investigation, Boulder City officials said.

The NTSB identified the operator of the Airbus Helicopters EC130 T2 as Las Vegas-based Papillon Grand Canyon Helicopter air tours, according to the AP.

Papillon officials did not immediately respond Wednesday to a telephone message seeking comment, the news organization reported.