WOODBURY, N.Y. (CBSNewYork) — A deadly seven-vehicle pileup on the New York State Thruway in Orange County was set off when a plow truck began spewing smoke, investigators said.

The accident, which involved a Thruway plow truck, two tractor-trailers and four cars, happened around 10:45 a.m. Wednesday on Interstate 87 near exit 16 in Woodbury, police said.

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Investigators said it all started when the plow truck pulled on to the shoulder after the engine compartment began smoking.

A car swerved out of the lane due to limited visibility from the smoke and struck a third passenger vehicle, investigators said.

A fourth car traveling north in the left lane then sideswiped the blade of the plow truck, investigators said.

Then a 2007 Toyota Prius driven by 53-year-old Mark Becker of Hillsdale, NJ slowed in the right lane. A tractor-trailer then rear-ended the Prius, pushing the car into the back of another tractor-trailer, investigators said.

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Becker was pronounced dead at the scene.

Six other people were taken to St. Lukes Cornwall Hospital where they were treated for non-life threatening injuries.

No arrests were made.

The investigation is ongoing.

The crash blocked all northbound lanes between exits 16 and 17 for nearly six hours.

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