Tapes released by the California Highway Patrol offer a new look at the initial moments of Saturday's plane crash at San Francisco International.

Dispatcher: “Were you on the plane?”

Passenger: “Yes! We've been on the ground 20 minutes, half an hour. People are on the tarmac with critical injuries. There's a woman we're trying to keep alive!”

Passengers who had made it off the airliner said there weren't enough medics to treat the victims and pleaded for more ambulances for the wounded. Two teen girls were killed and more than 180 others were injured when that Boeing 777 plane clipped a seawall. The response from the San Francisco Fire Department will be among a number of areas investigated by the National Transportation Safety Board.

AUDIO: 911 calls from the Asiana Plane Crash: