NORTHBROOK, Ill. (WLS) -- Five people are in the hospital after a semi-truck crashed into four cars stopped in traffic Sunday.
The crash happened just after 2 p.m. in the eastbound lanes of I-94 near the toll plaza in Northbrook, according to Illinois State Police.
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Multiple cars were stopped because of heavy traffic when a semi-truck failed to stop, striking the cars in front of it, police said.
Medics took five people to the hospital all with life-threatening injuries.
State troopers don't know why the semi driver didn't stop yet.
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Eastbound Illinois Tollway lanes were closed for several hours because of the crash. All eastbound lanes have been reopened as of 9 p.m.
Illinois State Police are investigating the crash.
The Sun-times Wire Media contributed to this post.