WESTFORD, MASS. (WHDH) - A multi-vehicle crash involving a tractor-trailer truck is snarling traffic in Westford during the Thursday evening commute.

Emergency crews responding to a report of a crash on Interstate 495 north near Exit 32 found several damaged vehicles and a trailer that had become detached from the truck that was hauling it.

Video from SKY7 HD showed traffic in the area backed up for miles.

There was no immediate word on injuries to those involved in the crash.

No additional information was immediately available.

The crash is under investigation.

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