"Explosion causes more than $600,000 in damage to Duluth rink":

DULUTH, Minn. - Investigators were trying to determine on Monday the cause of the Sunday night explosions that destroyed a local ice arena and injured several broomball players and fans.

People inside the building said they suspected the explosion came from a room containing an ice-grooming machine, which are often known by the brand name Zamboni...

(Via Br'er Drudge)