NEW : The killed includes one seriously ; one critically injured . Collision sets fire to an area near Arizona 's Regional Medical Center . ` ` We ' ve got lots of heaps of metal to get through , '' fire captain says .
NEW : Six killed includes one patient ; one critically injured . Collision sets fire to 10-acre area near Arizona 's Flagstaff Medical Center . `` We 've got lots of heaps of metal to go through , '' fire captain says .