Authorities say four people, including three children, were hospitalized after a gas explosion at a home in West Yellowstone.
Tuesday morning firefighters were called to a mobile home where officials say an explosion created a fireball that blew itself out.
Two people suffered severe injuries and two were moderately injured.
All of the victims were taken to a hospital in Rexburg.
The fire district is investigating with help from the State Fire Marshal's Office.
No other details were released.