That crash and others that followed it led in part to the National Fire Protection Association banning the practice of riding in the back of fire trucks.

A law that went into effect Tuesday requires fire departments to buy gear free of hazardous chemicals, and limit the number of work hours.

Authorities say two firefighters were killed and another was badly injured after they were ambushed and shot while responding to a wildfire near Coeur d'Alene, Idaho on Sunday afternoon.