Video appears to show initial impact of Tri-State Tollway crash

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GURNEE, Ill. -- Illinois State Police are investigating a new video that appears to show a violent crash along the Tri-State Tollway.

The crash happened just before 6 p.m. Monday on Interstate 94 near Great America.

The YouTube video shows a semi-truck plowing into a row of stopped cars at the Grand Avenue exit.

A total of six other vehicles are hit in the chain reaction.

The crash tied up traffic for about five hours, and firefighters had to extricate two of the victims.

One person was left in critical condition, and seven others were hurt.

No citations issued yet, according to the Chicago Tribune.