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

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

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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.

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In 1508, the League of Cambrai was formed by Pope Julius II, Holy Roman Emperor Maximilian I, Louis XII of France and Ferdinand II of Aragon to attack Venice.

CNN: Tuesday,