A crash Wednesday involving more than 40 vehicles shut down Interstate 95 between Newport and Bangor, state police said. The crash — which involves cars, a school bus and a tractor trailer in the northbound lanes — has injured at least a half dozen people, including some in serious condition, according to Maine State Police. Children on the bus were shaken up but not injured. The collisions began at about 7:30 a.m. ET in heavy snow that was falling near Etna, Maine, about 30 miles west of Bangor. Three separate accident sites are spread over less than half a mile.