The FBI makes arrests, usually of young men who it claims are holy warriors intent on attack.

NPR: Trial Begins For Men Accused In Fort Dix 'Pizza Plot'

The holy grail is a Day Zero attack, preventing something which has never been seen before.

FORBES: Intel Is Alive And Well: An Interview With CEO Paul Otellini

At the Cathedral of the Holy Cross in South Boston, photographs of the three people killed in the attack and a Massachusetts Institute of Technology police officer slain Thursday were displayed on the altar, each face illuminated by a glowing white pillar candle.

NPR: Boston Marks Week From Marathon Bombs With Silence