A New Hampshire man was driving the truck that crashed into another car on the eastbound lanes of the Massachusetts Turnpike in Westborough early Thursday.
The initial investigation showed a 2002 Honda Accord with five people riding in it had a flat tire and the driver continued to drive with the flat. The second vehicle, a 2011 Dodge Ram towing a boat trailer, clipped the slow-moving Honda, causing it to roll over.
Two of the passengers in the Honda, identified as Clarice Felix, 18, and Dave Virgile, 27, both from Randolph, were pronounced dead at the scene.
The driver of the Dodge, identified as Zachary Tucker, 24, of Deerfield, was treated and released at the scene.
Two other passengers, identified as Gregory Marcelin, 20, of East Weymouth, and Monique Sheppard, 20, of Roxbury, were taken to UMass Medical Center in Worcester to be treated for serious injuries.
The driver, identified as Bryant Brezil, 19, of Randolph, only suffered minor injuries.
The incident remains under investigation.