A cargo plane crashed Sunday at Denali National Park in the U.S. state of Alaska, killing three people on board.

The Fairchild C-123, registered to All West Freight Inc. of Delta Junction, Alaska, crashed at about 3:15 p.m. local time on Sunday into the park's Mount Healy, about 290 km north of Anchorage, Alaska.

Earlier, the park's spokesperson Kris Fister said the exact number of fatalities was hard to determine because "the plane pretty much disintegrated."

Names of those killed have yet to be released.

Investigators will arrive at the scene on Monday morning.