Flights resume on tribal land after fatal Grand Canyon crash

In this Saturday, Feb. 10, 2018, photo, a survivor, lower right, walks away from the scene of a deadly tour helicopter crash along the jagged rocks of

In this Saturday, Feb. 10, 2018, photo, a survivor, lower right, walks away from the scene of a deadly tour helicopter crash along the jagged rocks of

This is an undated family handout photo issued by Britain's  Foreign & Commonwealth Office  and made available on Tuesday Feb. 13, 2018 of Stuart Hill

This is an undated family handout photo issued by Britain's Foreign & Commonwealth Office and made available on Tuesday Feb. 13, 2018 of Stuart Hill

FLAGSTAFF, Ariz. (AP) — Flight restrictions put in place after a sightseeing helicopter crashed in the Grand Canyon have been lifted.

Three British tourists were killed in the crash Saturday on tribal land outside the national park. The medical examiner's office that did the autopsies says they died of multiple injuries.

The pilot and three other Britons were critically injured and taken to a Las Vegas trauma center.

The Federal Aviation Administration had imposed flight restrictions on the Hualapai reservation for any aircraft not involved in rescue and recovery efforts. A spokesman said Wednesday that those restrictions are no longer in effect.

The National Transportation Safety Board is investigating the cause of the crash. A preliminary report is expected before the end of the month.