Tires, Brakes Linked to Crash; Voice Data 'Good'

Brakes, tires, or landing gear likely caused the Denver airliner crash that injured 40 on Saturday, a source tells CNN. Meanwhile the National Transportation Safety Board is continuing its probe of the accident, and revealed that both black boxes on the plane contained clear information. "Tonight, we should have some overall characterization of what was said in that cockpit," said NTSB member Robert Sumwalt.

“We are here for one reason and one reason only, to find out what happened so we can keep it from happening again,” he added. Sumwalt refused to identify the captain or first officers, or say who was flying the Continental Airlines jet. The captain will be interviewed soon, he said, but investigators "want to be respectful of the captain's mental condition." (More Denver stories.)