CHICAGO (CBS) — A state trooper had to be cut out of the squad car Thursday after a serious multi-vehicle collision in west suburban Wheaton.

As WBBM Newsradio’s Mike Krauser reports, the incident started on Geneva road in Glen Ellyn.

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The trooper, according to a witness, rammed the back of a woman’s car.

Her husband said she was almost pushed into on-coming traffic and then the trooper hit her car again.

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She moved off the road and the trooper continued on into Wheaton hitting a number of other cars at Geneva road and Gary Avenue.

The man, who spoke to WBBM Newsradio from the hospital, said his wife was told by a Glen Ellyn police officer that the trooper had some kind of medical emergency.

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A fire department source said it is believed that the trooper had a medical emergency, which caused the crashes.