A state official says two people are dead and 21 injured after a tour bus ran off a southern Minnesota interstate and rolled over in a ditch.Minnesota department of public safety spokesman Andy Skoogman confirms the deaths from the crash that happened about 3:30 p.m. on interstate 90 west of Austin.The Minnesota State Patrol says the bus operated by Strain Bus Line Motor Coach Tours in Rochester was eastbound about 3:20 p.m. when it crossed into westbound lanes then crashed.Troopers say as bad as it was, it could have been an even bigger tragedy...Lt. Mathew Langer says, 'There were westbound drivers on I-90 that successfully avoided that bus coming through the median coming towards them; it certainly could have been a lot worse than it was.'Strain Bus Line operates a bus every Wednesday from Rochester to Diamond Jo casino in Northwood, Iowa.The patrol says the road was clear and dry.I-90 Westbound remains closed between the Oakland Road and Oakland Avenue West exits west of Austin, as authorities investigate the crash.