UPDATE: First I-80 Crash Caused Four Car Chain Reaction

Updated: 12:17 p.m. Monday

The second of two crashes that took place Monday morning was caused by slow traffic from the initial incident, according to Illinois State Police.

The four vehicle chain reaction crash took place on westbound I-80 near La Grange Road, east of the first crash site.

The Cook County Sheriff's Deputy involved in the chain reaction crash is currently being treated for non-life threatening injuries, including a possible broken ankle, at Silver Cross Hospital.  

All lanes on I-80 opened at approximtaly 9 a.m.

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Updated: 10:49 a.m. Monday

A Cook County Sheriff's Deputy has been transported to Silver Cross Hospital as a result of the second of two crashes that took place on I-80 at La Grange this morning, SunTimes Media reports.

The first of the two crashes occurred at 7:37 a.m. when a vehicle struck the interstate's concrete median, according to SunTimes Media.

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Two separate car crashes on I-80 at La Grange Road caused Illinois State Police to close all westbound lanes of traffic this morning.

The first crash involved one vehicle and took place at 7:37 a.m., according to Illinois State Police. The second crash involved four vehicles and occurred seven minutes later, at 7:44 a.m.

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The two crashes were unrelated. Both took place on the westbound side of the interstate.

All lanes of westbound traffic were closed for approximately one hour as a result of the crashes.

Three drivers were transported to Silver Cross Hospital with non-life threatening injuries.

State Police are uncertain about the cause of the accidents.

Check back with Patch throughout the day for updates on this story.