Itasca FD, PD, CareFlite ground EMS and others on scene of a multiple vehicle accident with entrapment on I35W near FM 67. Multiple ground ambulances have been requested to the scene along with Air Evac 51 and CareFlite 7 helicopters. Mutual aid responding from Grandview FD and Covington FD. Major delays on both northbound and southbound I35W. Northbound I35W is closed and southbound is down to one lane.