A tornado has torn through the US state of Montana damaging business and ripping the roof odd a sports stadium. The twister struck as a big storm system with golf ball-sized hail passed through the area. After running through Main Street in the city's northeast area, the twister quickly moved toward the 10,000-seat Rimrock Auto Arena about a half-mile away, where it hovered for about 15 minutes, snapping trees and telephone poles. The tornado was caught on tape with the pictures showing large amounts of debris flying through the air. Big pieces of metal were left hanging from power lines near the arena, and tangles of insulation and metal debris were strewn for hundreds of yards in the surrounding industrial area. There were several employees inside the arena when it struck, but there were no reports of injuries, police said, adding that there had been no reported deaths and no-one reported missing.