81.   Instead of an accidental torpedo strike, the new group suggested a mechanical failure caused an irreparable leak that flooded the submarine.

82.   Investigators are still searching for conclusive evidence showing whether the plane was destroyed by an explosive device or mechanical failure.

83.   Investigators have said the midair exposition that destroyed the plan could only have been caused by a bomb, a missile or a catastrophic mechanical failure.

84.   Investigators say they believe that the crash was caused by an unusual combination of mechanical failure and human error.

85.   Investigators also have no evidence of a mechanical failure.

86.   Investigators have been looking at three theories for the cause of the crash -- a bomb, a missile, or a mechanical failure.

87.   Investigators have still not determined whether the crash was the result of a bomb or missile or was caused by a mechanical failure.

88.   Investigators have theorized that a mechanical failure, a bomb or a missile may have ignited the fuel tank, causing the largest wave of the explosion.

89.   Investigators are examining the condition of the bus to determine whether a mechanical failure led to the crash.

90.   Investigators have said the midair explosion that destroyed the plan could only have been caused by a bomb, a missile or a catastrophic mechanical failure.