HARTFORD, Conn. (WTNH) – State police are investigating a large, four-car crash that took place on I-91 South in Hartford on Monday night.

Troopers said that the crash took place just after 6 p.m. north of the exit 33 off-ramp. A Nissan Altima was traveling in the left lane, and a Honda Civic was traveling in the center lane. For an unknown reason, police said the Honda swerved into the passenger side of the Nissan.

The Nissan then collided with the back of a Chevrolet Equinox, which had been traveling directly in front of it. Then, the front end of the Chevrolet struck another car traveling in front of it, a Subaru Impreza.

After all the vehicles struck, they came to a final halt in different areas of the roadway.

Two of the drivers did not report having any injuries and refused medical treatment. The driver of the Chevrolet was transported to a hospital with minor injuries, and the Honda driver was transported to a hospital with suspected life-threatening injuries.

All cars were towed from the scene, and police have said that this crash is still under investigation. Any witness to the collision is asked to contact Trooper Michael Dean at (86) 534-1098 or through email at michael.dean@ct.gov.

Furthermore, if you have a vehicle equipped with a dash cam, and you were driving in the area at the time of the collision, you are also asked to contact Trooper Dean.