41.   A congressional investigator was more skeptical.

42.   A prosecution investigator was dead, too, of a heart attack.

43.   A spokesman for Brooklyn District Attorney Charles Hynes said he believed investigators were unable to locate her.

44.   A safety board official, John Goglia, said investigators were particularly interested in a set of tire tracks.

45.   A team of dogs detected the scent of accelerants at two of the fires, but Theemling said investigators were still unsure how the fires might have been started.

46.   A woman drives up and says investigators have been to her house and left a message that they want to talk to her.

47.   Academic investigators are publicly plumbing available data.

48.   But a senior federal investigator working on the TWA case said investigators were interested in learning more about the meeting.

49.   But as more sites are checked, investigators are increasingly certain of their findings.

50.   But as yet investigators have been unable to determine what ignited those fumes.