MISSOULA, Mont. -

A vehicle rolled over on Interstate 90, east of Missoula near Clinton, close to mile marker 125 Monday afternoon.

I-90 was closed briefly in order to land a Life Flight helicopter. Traffic was backed up for about an hour, but has now been reopened.

Three victims were flown to St. Patrick's hospitals for what sounds like a broken leg and head injuries after the vehicle rolled off the interstate, through a barbed wire fence and across the railroad tracks.

Several passersby stopped to pull the passengers from the vehicle before it caught fire. An orthopedic surgeon who stopped at the crash site was able to help set the driver's leg before paramedics arrived.

Reports indicate a mother and two children, ages 1 and 4 were involved in the crash.  The mother is being transported to Harbor View Medical Center in Seattle for a leg injury, while the two children sustained only minor injuries.

Highway Patrol is still investigating the cause of the crash and NBC Montana will keep you updated as we learn more.