Police said a woman died when a dump truck rolled onto the minivan she was driving in Gorham. Police said the dump truck was heading east on Route 25 at about 9 a.m. Thursday when it swerved into the westbound lane to avoid hitting a pickup truck that had stopped to make a turn. The truck collided with the minivan, then rolled on top of it. The minivan driver — 68-year-old Marjorie Mullett of Dayton, Maine — was killed. Her passenger and the driver of the truck were taken to a hospital with injuries that are not considered life threatening. The accident is under investigation.