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.

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.

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.