updated 3/28/2007 4:10:36 PM ET 2007-03-28T20:10:36

A major snowstorm blew through the central Rockies on Wednesday, contributing to an highway pileup involving a school bus and four tractor-trailers in northern Wyoming.

Winter storm warnings were posted for most of Wyoming, southeastern Montana, central Utah and the Colorado mountains. Blizzard warnings were posted for parts of northern Wyoming and southeastern Montana.

Up to 2 feet of snow could fall at higher elevations, with up to 8 inches in lower areas.

The bus was carrying 36 students from Tongue River High School to a competition in Cheyenne in the state's southeast, school officials said.

Three or four people were taken to a hospital. No one on the bus was hurt, said state Highway Patrol spokesman Sgt. Stephen Townsend. Their conditions were not immediately available.

One of the big rigs that crashed on Interstate 90 was hauling diesel fuel when it overturned and authorities said it was leaking fuel. The accident closed a 90-mile stretch.

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