(CNN) — Three people were killed Thursday in a 30-vehicle pileup on Interstate 94 in northern Indiana during whiteout conditions, according to state police.
More than 20 people were sent to area hospitals, including one person with life-threatening injuries, according to Sgt. Ann Wojas of Indiana State Police.
Pictures from the pileup showed at least six tractor-trailers sandwiched together. Police said half of the vehicles in the wreck were tractor-trailers.
LaPorte County was experiencing heavy snow and extreme cold and winds.
Police Lt. Pete Wood said it could take 12 to 24 hours until things get back to normal on I-94. Motorists were urged to find alternative routes.