31.   U.S. investigators say they suspect suicide because the flight data recorder, an advanced model, does not give evidence of mechanical malfunction.

32.   While the pattern of damage to the fuel tank shows that it did explode, no one knows the cause, mechanical malfunction or an explosive device.

33.   Yet as the investigation dragged into its sixth month, it seemed possible that the true cause was an unidentified mechanical malfunction.

34.   A Greek fighter jet crashed near a military airfield Thursday after a mechanical malfunction, but the pilot safely ejected, officials said.

35.   A mechanical malfunction was apparently the cause of the crash, she said.

36.   A mechanical malfunction was believed to be responsible for the accident, according to the radio report.

37.   Authorities say the explosion was caused by either a bomb, a missile or a mechanical malfunction.

38.   FAA inspectors determined that mechanical malfunction did not cause the door to open, spokesman Jerry Snyder said.

39.   FAA inspectors determined that mechanical malfunction had caused the door to open, spokesman Jerry Snyder said.

40.   Investigators later blamed a mechanical malfunction.