31.   British NATO peacekeepers said they were investigating the cause of the blast.

32.   Canadian police and Transport Canada are investigating the cause of the crash.

33.   Fire marshals are still investigating the cause but believe it was an electrical fire, said Jack Thompson, a spokesman for the Fire Department.

34.   Fire marshals spent the evening investigating the cause of the fire.

35.   Fire officials were still investigating the cause of the fire, but they said the blaze had started in a convertible sofa.

36.   Four months after the crash, the National Transportation Safety Board is still investigating the cause.

37.   Government officials are investigating the cause of the crash and are not ruling anything out, although they said it does not appear to be an act of terrorism.

38.   Hauer said officials from the Federal Aviation Administration were investigating the cause of the crash.

39.   He said department engineers were investigating the cause of the erosion around the pilings.

40.   He said police were also investigating the cause.