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Police said the teenager was covered in foam that rescuers had sprayed on the burning wreckage. When the truck moved while battling the flames, rescuers discovered her body, Esparza said.

“The driver may not have seen the young lady in the blanket of foam,” said Ken Willette of the National Firefighter Protection Agency, which sets national standards for training airfield firefighters. “These could be factors contributing to this tragic event.”

He said firetrucks that responded to the Asiana crash would have started shooting foam while approaching the fuselage from 80 or 100 feet away. The foam was sprayed from a canon on the top of the truck across the ground to clear a safe path for evacuees. That was supposed to create a layer of foam on the ground that is several inches high before the truck gets to the plane.

The victims were close friends and top students, looking forward to spending a few weeks at a Christian summer camp in California, where they planned to practice English and boosting their chances of attending a U.S. college.

Their parents were flown to San Francisco after their deaths where the Chinese consulate was caring for them.

September Mao, who attends the girls’ school in the city of Jiangshan and knew them both, said Wang was outgoing and popular, and often interviewed her classmates as a student reporter. She said Ye was a very good singer and speaker, “loved to smile, and liked to share everything and anything that is happy.”

Photos of the girls showed the pair with wide grins flashing peace sign. In one photo, they formed their arms into the shape of a heart.

The airliner collided with a rocky seawall just short the runway. Dozens of other passengers were injured, and although 182 were taken to hospitals, most suffered only minor injuries.

Nearly a week after the crash, the investigation indicates the pilots, a trainee and his instructor, failed to realize until too late that the aircraft was dangerously low and flying too slow.

Nothing disclosed so far by the National Transportation Safety Board investigators indicates any problems with the Boeing 777’s engines, computers or automated systems.