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.

The deadly crash of a medical transport plane on the Navajo Nation in northern Arizona has left the medical community in New Mexico heartbroken