1.   Conceding that they are stumped in the Unabom case, federal investigators released several intriguing new clues about the mystery bomber in order to generate public interest.

2.   Eventually, through a calculated plan aimed at maximum exposure, the mystery bomber managed to get his manifesto published and widely read.

3.   Investigators have run through a long list of potential mystery bombers in the weeks since the attack.

4.   Mystery bombers are trying to panic Paris, but most Parisians shrug off the threat.

5.   Police reported them for the first time Wednesday as the hunt for the mystery bomber was stepped up.