A Chinese girl seriously injured in the crash of an Asiana Airlines jet in San Francisco has died in hospital, becoming the third victim of last weekend's crash.

The teenage girl, who died yesterday morning, had been in a critical condition, according to two doctors at San Francisco General Hospital.

Her parents asked the hospital not to release further information. The girl was a Chinese national, according to the Chinese Consulate in San Francisco.

She was part of a group of students from eastern China who were visiting the US to attend summer camp, one of the trip organisers said. He said she was 16.

The crash landing of the Boeing 777 also killed two other Chinese girls from the school group and injured more than 180 people.

Ye Mengyuan and Wang Linjia, who died last Saturday, were sitting in the back of the plane, which hit the seawall as it came in to land.

One of the girls was run over by a fire truck rushing to the scene, the San Francisco Police Department has said, although it is unclear whether she was still alive at the time.

She was obscured by fire retardant foam and was found in the fire truck's tracks when it moved to fight flames in the fuselage, police spokesman Albie Esparza said.

The coroner in San Mateo County, where the airport is located, has said he will release the autopsy results of the two girls within two weeks.

NTSB apology over fake pilot names

Meanwhile, the National Transportation Safety Board has apologised after an intern mistakenly confirmed to a local television station racially offensive fake names for the pilots of the flight.

"The National Transportation Safety Board apologises for inaccurate and offensive names that were mistakenly confirmed as those of the pilots of Asiana flight 214, which crashed at San Francisco International Airport on July 6," the NTSB said in a statement.

"Earlier today, in response to an inquiry from a media outlet, a summer intern acted outside the scope of his authority when he erroneously confirmed the names of the flight crew on the aircraft."

A presenter for Oakland station KTVU read a list of the supposed names of the pilots on its noon broadcast after an employee apparently called the NTSB seeking to verify them.

The names appear to mock the events of the crash. The prank names were: Captain Sum Ting Wong, Wi Tu Lo, Ho Lee Fuk and Bang Ding Ow.

KTVU anchor Tori Campbell later came back in the same programme and told viewers the names "were not accurate despite an NTSB official in Washington confirming them late this morning".

"We apologise for this error," she said.

The names of the actual Asiana Airlines pilots in the cockpit of the plane were released earlier this week as Lee Kang-kook and his co-pilot Lee Jeong-min.