A mechanical problem ignited a limousine fire that killed five nurses trapped in the back, the California Highway Patrol said Monday as it released results of its investigation and 911 calls filled with screams from those inside. The blaze broke out on the San Mateo-Hayward Bridge on May 4 because of a catastrophic failure of the rear suspension system, CHP Capt. Mike Maskarich said. The air suspension failure allowed the spinning driveshaft to contact the floor pan, causing friction that ignited carpets and set the vehicle on fire, authorities said. No charges will be filed, prosecutors said. "Some tragedies are crimes and some are not, and this one is not," San Mateo County District Attorney Steve Wagstaffe said at a joint news conference with the CHP. Recordings of 911 calls released Monday include a woman's voice shouting, "Oh, my god! Oh, my god!" and a man's voice shouting "Get out! There also were cries and screams from callers and passengers. "It's a limousine that's fully engulfed, and there are people trapped inside," one caller said. A woman who said she was a passenger screamed as she told the dispatcher there were people inside the burning limo. On another call a rescuer told a dispatcher: "I don't think there is anything we can do." "The rear of the limo is fully engulfed, and the doors are locked," the rescuer said. Investigators said one of the rear doors had the child lock engaged, and the other side of the limo was too burned for them to tell. One caller broke into tears as he described the scene to an operator who reassured him that help was coming. In interviews with investigators, the survivors described a harrowing escape. "I had to push Jasmin (Deguia) through the window, and Nelia (Arellano) pulled me out through the driver's side door," Amalia Loyola told investigators during an interview at the hospital hours after the fire, according to the investigation report. Deguia said she was the third one out. When I was getting out of the limousine, the partition was so small my hips got stuck between the partition and the small ledge. I was hanging out headfirst," she said. Loyola was the last one out. "We all waited for other people to get out, but no one did," said Deguia. Brown, 46, of San Jose, said at first, with the music in the limo turned up, he misunderstood what one of the passengers in the back of the 1999 Lincoln Town Car was saying when she knocked on the partition window. "I thought she was asking if she could smoke," Brown said in an interview transcript released Monday. He said seconds later, the women knocked again, this time screaming, "Smoke, smoke!" and "Pull over." Brown said he got out and "tried to call 911, but it was busy." Another passenger, Grace Guardiano, said the driver was "standing out there on his phone," after stopping the limo. "He did not open the doors," Guardiano said. I went out through the partition and called 911 from outside.