HENDRICKS COUNTY, Ind. - One person has died after at least 40 vehicles, including 23 tractor-trailers, were involved in a pileup on westbound Interstate 70 in Hendricks County.
The crash happened just after 2 p.m. Thursday near State Road 267, closing both directions of the highway.
IMAGES: Slideshow of pileup images
Harry Sohal, 25, of Ontario, Canada, was in the sleeper compartment of a tractor-trailer being driven by is father, Satpal Sohal, 51, when the crash happened.
"He was in the sleeper berth of the semi operated by his father and the truck jack-knifed and, unfortunately, he was critically injured and succumbed to his injuries last evening," said Sgt. Rich Myers with Indiana State Police.
Harry Sohal was pronounced dead just after 11 p.m. Thursday at Methodist Hospital.
As of Friday morning, four other people were stable condition and seven others had been treated and released.
State police have classified the pileup as two different accidents -- one eastbound and one westbound -- involving 23 tractor-trailers and 17 other vehicles.
Police said Thursday's blowing snow and frigid temperatures contributed to the crash.
"It's a little worse because we had the clear conditions where people are traveling along at speed, you don't expect anything, you get that whiteout, and it's a sad situation," Myers said.
RTV6 Chief Meteorologist Kevin Gregory said heavy snow squalls fell at times, alternating with moments of sunshine.
Hazmat crews were called in to clean up fuel and other materials that were being carried by some of the semis.
Police said determining the cause of the crash will take days.
"It's still very very early in the investigation," Myers said. "We're still trying to match up injured people that have been transported, to vehicles that were left at the scene, to vehicles you can't tell what they are... trucks with their fronts ripped off of them, so we're trying to find out who owns those."
Watch RTV6 and refresh this page for updates.