Crash• #(Continued)^ Information might be determined from the marks made inthe ground by scattered parts: of the'aircraft.All- four engines were found.f'It is apparent there was;a fire of some kind in flight, Boyd said.It is going to be a long time before we are going to be able to make, any sort of definitive conclusions on what caused this unfortunate accident”; ; .In response to repeated question^ Boyd said there was nothing so far to indicate any sabotage.Earlier in the day, a federal investigator expressed the certainty that the airliner exploded before it crashed, but did not rule out lightning or a bomb as the cause of the explosion.rIf