( CNN ) -- A third person -- identified only as a girl -- has died from injuries sustained in last week 's crash of Asiana Airlines Flight 214 , officials at the San Francisco hospital where she was being treated said Friday . San Francisco General spokeswoman Rachael Kagan said the `` minor girl '' had been in critical condition at the Bay Area hospital since last Saturday 's incident . The hospital did n't release any information about the girl -- including her name , age or ethnicity -- who died Friday morning , according to Dr. Margaret Knudson , the hospital 's chief of surgery . `` It 's a very , very sad day today at San Francisco General Hospital , '' said Dr. Geoffrey Manley , chief of neurosurgery . `` We have all done everything we could . '' Two other people -- both 16-year-old girls from China -- were reported dead soon after the Boeing 777 crash-landed at San Francisco International Airport . One of those teenagers was hit on the runway by a fire truck , though it 's not clear whether she was already dead when she was struck , San Francisco police spokesman Albie Esparza told CNN on Friday . At the time , firefighters were using flame retardant that ended up surrounding areas immediately around the plane with foam , Esparza said . `` 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 , '' he added . 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 . `` Right now , we are waiting results from the coroner to determine if she died from the crash or the fire engine going over her , '' the police spokesman said . `` And that will be part of our investigations , like any other case , by our hit-and-run and major accidents investigations teams . '' Of the passengers and crew on board , 304 people survived -- 123 of whom walked away relatively unscathed and the remainder sent to hospitals . A handful of them remained hospitalized , including six patients at San Francisco General as of 3 p.m. ( 6 p.m . ET ) Friday . That hospital 's figure include two adults in critical condition with spinal cord injuries , abdominal injuries , internal bleeding , road rash and fractures . Besides the passengers and crew members ' physical recovery , San Francisco International Airport is working to get back to normal as well . The airport was shut down to incoming and departing traffic for several hours after the Asiana crash , which occurred around 11:30 a.m. Saturday . Two of its four runways reopened later that day , though the charred remnants of the downed 777 remained -- a visible reminder of the horror that had unfolded . Early Friday morning , that airline 's fuselage was hauled away on flatbed trucks to a remote section of the airport , said San Francisco International Airport in a press release . By 5:05 p.m. , a Southwest Airlines jet landed on the runway where the crash occurred -- signifying that , for the first time in six days , all four of the airport 's runways were operational . `` The tremendous efforts and around-the-clock work of airport staff , government agencies , airline tenants and contractors allowed us to complete all repairs and safety certifications for Runway 28L in a timely and efficient manner , '' said airport director John L. Martin . While the wreckage has been hauled away , investigators still have not pinpointed exactly why Flight 214 crashed , or who was to blame . An in-depth review of the cockpit voice recorder shows two pilots called for the landing to be aborted before the plane hit a seawall and crashed onto the runway , the head of the National Transportation Safety Board said Thursday . The first internal call by one of the three pilots in the cockpit to abort the landing came three seconds before the crash and a second was made by another pilot 1.5 seconds before impact , NTSB chief Deborah Hersman said . The agency has begun wrapping up its investigation at the airport and crews are cleaning up the debris left by the crash . Investigators turned the runway back over to the airport . The runway has been closed since Saturday 's crash . The investigation is shifting back to NTSB headquarters in Washington , where authorities will work to find a more definitive answer about what led to the crash . The passenger jet 's main landing gear slammed into the seawall between the airport and San Francisco Bay , spinning the aircraft 360 degrees as it broke into pieces and eventually caught fire . CNN 's Chelsea J. Carter , Augie Martin and Ed Payne contributed to this report .
NEW : All Friday at San Francisco airport are now operational , airport says . A girl , who 'd been in critical condition , died four runways 3 p.m. at a San Francisco 's hospital . A teen who died earlier was hit by fire truck , police say . Her body was believed to be covered in foam sprayed by firefighters , spokesman says .