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Massachusetts State Police say they are investigating a traffic death in which a 27-year-old man was "struck by multiple vehicles," none of which stopped. 

The fatal hit-and-run happened late Saturday night along Interstate 290 in Worcester. 

"Preliminary investigation indicates that the victim had been struck by an unknown vehicle, possibly a tractor-trailer. Evidence indicates that he was subsequently struck by other vehicles," the Massachusetts State Police said in a statement. 

"None of the vehicles stopped," police added. "It is unclear if any of the operators knew they had struck a person." 

MAN CRASHES CAR INTO CROWD HONORING VICTIMS OF FIRE, LEAVING 1 DEAD, 17 INJURED: POLICE 

Interstate 290 Massachusetts

The victim was struck along this stretch of road on Interstate 290 in Worcester, Mass. (Google Maps)

Massachusetts State Police vehicle parked on a road

Massachusetts State Police were among the agencies that responded to the scene. (Massachusetts State Police)

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The 27-year-old victim, who has not been publicly identified, was pronounced dead at the scene. 

It was not immediately clear why the man was on the highway. 

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Massachusetts State Police say the crash remains under investigation.