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BIRMINGHAM, Ala. (AP) - Investigators are combing through the wreckage of a UPS jet that crashed at Birmingham's airport, killing two pilots.

The search Thursday focused on the tail section of the aircraft. That's the area that typically contains the plane's black boxes.

The National Transportation Board hasn't said whether it has located the cockpit voice recorder or the flight data recorder.

The two devices could hold key evidence about what happened as the jet was attempting to land in Birmingham early Wednesday. The plane slammed into a hillside just short of the runway.

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