A two-vehicle accident that occurred on Ohio 7 northbound near Hanover Street in Martins Ferry at approximately 9 a.m. snarled traffic Monday. The accident involved a box truck and an 18-wheeler. Both occupants of the box truck were Life-flighted to a pair of Pittsburgh-area hospitals. Included in those were a 10-year-old girl who was said to have life-threatening injuries. The Ohio Highway Patrol is investigating.