By Tim McNicholas

CHICAGO (CBS) — Illinois State Police were investigating a Facebook video that appears to show a road rage brawl Thursday morning on Interstate 57.

Police say it all happened around 7:15 Thursday morning in the northbound lanes at Halsted Street.

At the start of the video, a woman can be seen swinging a baseball bat from the open driver’s side window of her car, while pulling in front of a Hyundai Sonata in the left lane.

After stopping behind a traffic jam, the woman gets out and appears to hit the hood of the Hyundai with the bat.

Two women then get out of the Hyundai and walk up to the other car. One of them begins fighting with the other driver, pulling her hair and punching her in the face.

As the two continue trading blows, the driver of the Hyundai picks up the baseball bat and appears to start swinging at the other driver before the video ends.

“An investigation has ensued and is currently in its preliminary stages,” Illinois State Police Sgt. Jacqueline Cepeda stated in an email.

The video has been viewed 1.5 million times on Facebook.

The man who recorded the video asked to stay anonymous but told CBS 2’s Tim McNicholas he was driving on I-57 when he saw a someone toss a water bottle at another car. Then he started recording.

State troopers say they got calls about the fight, but when they showed up, they couldn’t find anyone involved.

CBS 2 searched for one of the car owners by the license plate to get her side of the story but has not been able to reach her.

State police are asking anyone who witnessed the incident to call police, even if they prefer to stay anonymous.

The man who recorded the video posted it to social media but has since taken it down.

Tim McNicholas