11.   The FAA, however, is pursuing two theories about the problem that do not appear to be particular to the machine in Gibbsboro.

12.   Police had not yet determined the type of flammable material used or the motive for the attack, although investigators were pursuing several theories, he said.

13.   But The Daily Oklahoman reported Wednesday that agents also were pursuing a theory that he died in the blast.

14.   Diverse theories are being pursued by federal investigators as they try to interpret key bits of evidence in the Oklahoma bombing.

15.   Kallstrom said the bureau was pursuing many theories.

16.   U.S. investigators are pursuing a theory that the bomb-laden cards were mailed by followers of a radical Egyptian sheik, Omar Abdel-Rahman.

17.   But now they are pursuing the theory that the group is in Costa Rica, split in two with each holding one of the hostages.

18.   The weekly said that detectives were pursuing the theory of a French network after two men were charged with terrorist-linked criminal conspiracy earlier this month.

19.   The Daily Oklahoman newspaper reported that agents were also pursuing a theory that the second man died in the blast.

20.   The Daily Oklahoman reported that agents were also pursuing a theory that the second man died in the blast.