A small medical transport plane crashed and caught fire Tuesday on the Navajo Nation in northern Arizona, killing all four people on board, the tribe said.

These were people who dedicated their lives to saving others, and their loss is felt deeply across the Navajo Nation,” Buu Nygren, the Navajo Nation president, wrote in a statement.

A small medical transport plane crashed and caught fire Tuesday on the Navajo Nation in northern Arizona, killing four people, the tribe said in a statement. A Beechcraft King Air 300 from the CSI Aviation company left Albuquerque,