Massachusetts October 6, 2017 12:15 pm Authorities on Scene of Rollover Crash A tractor-trailer rolled on top of a car in Westford, Massachusetts, pinning the car’s driver. US & World Videos 4:17 Police presence grows at pro-Palestinian encampment at Northeastern 5:39 Billerica police sergeant hit and killed by excavator during construction detail 2:31 Celtics preparing for pivotal Game 3 against Heat in Miami 2:37 Quincy detective resigns amid allegations of ‘unwelcome, sexually explicit conduct' 4:07 Officer hit and killed while working construction detail in Billerica, authorities say