A grain elevator exploded in Plainview, Minnesota this morning, about 20 miles northeast of Rochester. No one was hurt but it knocked out power and phone service to the town's downtown. The Doane (DOAN) Grain Services Incorporated elevator burned for about two hours. Authorities aren't sure what caused the explosion. The Plainview explosion comes just days after a grain elevator explosion in Wichita, Kansas killed five people. One man is still missing. Minnesota Occupational Safety and Health Administration manager and former grain elevator inspector Terry Mueller (Myoo-ler) says most explosions are caused by some sort of friction in the mechnics of the elevator which ignites the grain dust.