Evidence on engines puzzling in crash probe — ‘The White House and the safety board said Monday the crash appeared to be an accident, but the spread of aircraft parts – and the inability to blame the crash on an engine explosion immediately – raised some doubts about that conclusion.

”It’s a very mysterious and disturbing turn of events,” said the former official, who spoke on the condition of anonymity to maintain the investigators’ confidence.

In presenting the news to the public, the NTSB chairwoman, Marion Blakey, put on a positive face. The investigation is her first; she was sworn into office on Sept. 26.’ Boston Globe