Major Accident (Frisco/Plano)

Frisco Quint 8, Medic 8, Plano Engine 10, multiple law enforcement, and others are on scene of a major accident involving a semi truck on westbound Sam Rayburn Tollway (121) between Custer and Independence. At least two patients with potentially serious injuries. Command has requested three ambulances to the scene. Reported to involved a jack-knifed 18 wheeled in the ditch.