WILMINGTON (CBS) — State Police are investigating a serious two-vehicle crash on Interstate 93 southbound in Wilmington on Monday.

Officers were called to the crash near exit 40 around 5:40 p.m.

READ MORE: Target Will Once Again Require Some Employees To Wear Face Masks

A preliminary investigation indicates that a 25-year-old Brockton man was driving south on the highway in a 1999 Mercury Grand Marquis, when his vehicle rear-ended a 2007 tractor-trailer, which had slowed down due to heavy traffic.

The driver of the Mercury was flown by MedFlight to Brigham and Women’s Hospital. He suffered serious injuries.

Police say a seven-month-old female passenger in the car was not injured.

READ MORE: Surveillance Video Shows Suspect Smashing Into, Running From Franklin Jewelry Store During Robbery

A 30-year-old Atkinson, New Hampshire man driving the tractor-trailer was not hurt.

State Police are investigating a crash on Interstate 93 southbound in Wilmington. (WBZ-TV)

State Police are investigating a crash on Interstate 93 southbound in Wilmington. (WBZ-TV)

The cause of the crash remains under investigation.

No one has been arrested.

Traffic was backed up for nearly an hour.

MORE NEWS: Barack Obama's 60th Birthday Party On Martha's Vineyard This Weekend To Have COVID Safety Coordinator

State Police were assisted by Wilmington firefighters.