(CNN) -

Asiana Airlines Flight 214 passenger Ye Mengyan died of injuries she received from being run over by a fire department vehicle, and she was alive when she was hit, authorities said Friday.

Ye's death was "multiple blunt injuries that are consistent with being run over by a motor vehicle," San Mateo County Coroner Robert Foucrault said.

Police previously said she might have been hit by a fire truck after she was expelled from the crashed plane.

Ye, 16, was one of three people who died in the July 6 crash of Flight 214 at San Francisco's airport and its aftermath.

A San Francisco police spokesman last week said that at the time, firefighters were using flame retardant that ended up surrounding areas immediately around the plane with foam.

"When the truck repositioned itself to get a better aim of the fuselage, they discovered the body of the victim in the fresh track from the path of the truck," San Francisco police spokesman Albie Esparza said.

The foam was thick enough to cover a body, Esparza noted. Moreover, it is difficult for those in the "industrial-size" fire trucks that responded to crash to see things on the ground, the police spokesman said.

Asiana Flight 214 was carrying 291 passengers and 16 crew members when it crash landed July 6 on the runway after striking a seawall.