At least 20 vehicles crashed on a rural Wyoming interstate in blizzard conditions Sunday, killing at least six people, officials said.

An undetermined number of injured victims were taken to hospitals in Laramie and Rawlins, the Wyoming Highway Patrol said.

Troopers at the scene reported strong winds that reduced visibility to zero. Interstate 80 was closed about 50 miles from Cheyenne to Laramie, at the request of Laramie officials, who said there was no parking left in the town for semitrailers.

Troopers were still clearing vehicles late Sunday from the scene west of Laramie and released few details about the crash, which was reported shortly after 4 p.m. Several smaller crashes also occurred behind the 20-vehicle crash, troopers said.

U.S. 30 westbound out of Laramie was also closed because of the weather, and additional crashes were reported there.