NEW : Six killed includes one patient ; one critically injured . Rescue workers sift through wreckage from two medical helicopters that collided midair Sunday afternoon . The hospital said the patients were in critical condition and that it was working to identify them. `` We 've got lots of heaps of metal to go through , '' fire captain says .
NEW : Six killed includes one patient ; one critically injured . The hospital said the patients were in critical condition and that it was working to identify them. `` We 've got lots of heaps of metal to go through , '' fire captain says .