BUFFALO, NY - Officials have now released 911 calls made by passengers and witnesses desperate for help after the crash of Asiana Air in San Francisco.
Federal safety officials say a pilot initially told passengers not to evacuate that airplane -- in fact, people did not begin fleeing the aircraft until 90 seconds later when a fire erupted.
Officials say the delay occurred as the pilot checked with the tower at the airport.
The Asiana flight crashed Saturday when its landing gear and then its tail clipped a rocky seawall just short of the runway. Seconds after that crash -- emergency calls began flowing in. Many of the calls were made by passengers still on the plane, pleading for help.
911 Call: "We just got in a plane crash and there are a bunch of people who still need help and there are not enough medics out here that can help. There is a woman out here on the street, on the runaway, who is pretty much burned very severely on the head and we don't know what to do."
911 Call: "Yes, I was on the plane. We got on the -- we've been on the ground, I don't know, 20 minutes? A half-hour? There are people laying on the tarmac with critical injuries; head injuries. We're almost losing a woman over here. We're trying to keep her alive."
Survivors of the crash were allowed to tour the wreckage Wednesday.
The crash killed two Chinese teenagers -- and injured many others.
Twenty victims are still in the hospital this morning, four of them with critical injuries.
The NTSB is still investigating and says it could take months or even years before a definitive cause is known.