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DETROIT - Authorities say at least threepeople have been killed and about 20 injured in a massive freeway crash in Detroit involving at least two dozen vehicles in icy, snowy conditions.

Michigan State Police Lt. Michael Shaw tells WDIV-TV that the deaths and injuries happened in a chain-reaction crash Thursday morning on a mile-long stretch of Interstate 75 on the southwest side of the city. Shaw says the injured, including children, have been taken to hospitals.

Numerous fire engines and ambulances are at the scene. Witnesses describe white-out conditions and slippery roads.

Shaw says many people had to be pulled out of vehicles.