A B-1B bomber crashed near Broadus, Mont. during a routine training mission on Monday.

The Air Force has released the names of the four South Dakota crew members who safely ejected from a B-1B bomber that crashed in Montana.

Maj. Frank Biancardi II and Capt. Curtis Michael were the instructor pilots on board. Capt. Chad Nishizuka and Capt. Brandon Packard were weapons system instructors.

All four suffered injuries and are being treated or already have been released.

The Air Force will conduct a thorough investigation to determine the cause of the accident.