Three survivors of Asiana Airlines Flight 214 remained in critical condition at a San Francisco hospital Thursday after another Bay Area facility said its last critical patient from the plane crash had been upgraded.

San Francisco General Hospital reported two adults and one child still in critical condition. Officials said they were undergoing treatment for spinal cord, traumatic brain and abdominal injuries, along with internal bleeding, road rash and fractures.

In all, seven patients -- five adults and two children -- remained at the San Francisco facility, down from eight Wednesday.

Only two people remained at Stanford Hospital on Thursday morning, officials said, down from four the day before. One of the remaining patients had been upgraded from critical to serious condition; the other was listed in good condition.

The Palo Alto medical center and its children's hospital treated 55 patients from Saturday's crash at San Francisco International Airport.

San Francisco General said Thursday it had seen 67 survivors of the flight, up from the 62 previously reported. The higher number includes people who sought treatment this week, including four children who went to the hospital's pediatric urgent care clinic Monday evening with "complaints from the accident," the hospital said, and an adult who went to the emergency room Wednesday "complaining of an injury from the accident." All were treated and released.

More than 180 people were injured when the Boeing 777, which investigators say was flying too low and too slow as it approached the airport, struck a sea wall and crashed onto the runway.

Two 16-year-old girls from China, Wang Linjia and Ye Mengyuan, were found dead on the tarmac after the crash. They were part of a group of Chinese students on their way to a summer camp in Southern California.

The National Transportation Safety Board is investigating the crash.

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