Pilot 'knew plane was too low'

The senior pilot in the cockpit of Asiana flight that crashed landed in San Francisco airport on Saturday realised the plane was too low when it was flying at only 500ft (152m), an official has said.

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Mechanical failure not a factor in San Francisco crash

US officials have examined "black boxes" from the Asiana Airlines Boeing 777 flight that burst into flames upon landing in San Francisco, killing two teenage Chinese students.

There was no immediate indication of the cause of Saturday's accident but Asiana said mechanical failure did not appear to be a factor.

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