Dallas police and fire are responding to a serious crash on the Dallas North Tollway at Northwest Highway (also known as Loop 12). Police believe a multi-car crash involving a semi-truck. Multiple injuries have been reported. Police are just starting their investigation, and details are limit ed. Dallas Fire-Rescue said the truck hit multiple vehicles and then a wall. 911 callers claim at least 6 vehicles were hit, but officials are working to verify those claims. NBC 5 has learned two people were hospitalized and first responders remain on scene. The 18-wheeler was carrying diesel, which has spilled, prompting a HazMat response. The road is not closed. Check back and refresh this page for the latest updates. ...read more read less