11.   Postal investigators said the package containing the latest bomb appeared to be larger than earlier ones mailed by the elusive serial bomber.

12.   Shortly after the Scrutton death, the FBI announced that it was pursuing a serial bomber.

13.   The blast was one of three apparently related bombings or attempted bombings here in the last week, raising the prospect that a serial bomber was at work.

14.   The bomb was later determined by federal law-enforcement officials to have been designed by the serial bomber known as the Unabomber.

15.   The cases also show why the peculiar logic of a serial bomber makes him harder to catch than someone who sets off bombs for more specific reasons.

16.   The FBI hopes the University of Washington professor can help it find the notorious serial bomber.

17.   They found them on a device mailed several years ago by the technophobic serial bomber.

18.   A U.S. serial bomber may have struck again, this time killing a timber industry executive who lobbied to have the spotted owl removed from the endangered species list.

19.   Both newspapers quoted FBI officials as saying that the document has enabled them to trace a pattern of academic involvement by the elusive serial bomber.

20.   But since the Oklahoma City bombing, the mysterious serial bomber has sent a flurry of letters out into the world.