A crash involving four vehicles left at least one person seriously injured on the Mass Pike heading west, according to State Police, leaving drivers stuck in heavy traffic for hours Friday night.

Westborough Fire said multiple units were called to a portion of the highway near the exit for Route 495 in Westborough around 8:30 p.m.

The department said the turnpike was “closed due to a serious crash” that involved a “rollover crash on fire.”

Massachusetts State Police said a passenger in one of the vehicles involved was left with serious injuries, but was conscious as she was brought to a local hospital.

An MSP spokesperson stated that, due to the severity of the crash’s injuries, a Crash Reconstruction unit and Crime Scene Services were called in.

MassDOT and other emergency personnel teams responded to the crash, as well. The MSP spokesperson also noted that the Worcester County District Attorney’s Office had been notified.

In an update at 9:36 p.m., Westborough Fire said one lane of traffic had been reopened, while all others remained closed.

Throughout the crash response, numerous drivers sat idle or with their vehicles turned off on the Pike, with some drivers telling 7NEWS on social media that they waited as long as one or two hours.

By the late evening hours, the crash scene was completely cleared and normal traffic resumed.

The cause of the crash remains under investigation.

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