Numerology?

Austin Bay sees some patterns with the Mumbai bombing:

Terrorists didn't need to conduct a detailed reconnaissance. The commuter trains of Mumbai (Bombay), India, classify as a "very soft target." According to Indian government statistics, 6 million people a day ride Mumbai's commuter trains. Checking every bag and briefcase is simply a logistical impossibility.

As an operation, India's 7-11 repeats methods and techniques exploited in London's 7-7 and Madrid's 3-11 -- serial bombs detonated on mass public transportation. The Madrid Method is a proven, blood-soaked concept -- scatter a few time bombs on city trains, and high explosive wreaks its deadly evil. The Mumbai attack also echoes the 9-11 attack on lower Manhattan, for Mumbai is India's financial center. Bombing a financial center exacts an immediate international economic cost.

[snip]

Americans will immediately think of al-Qaida and point to the hideous numerology -- 9-11, 3-11, 7-7, 7-11 -- as a clue. Roll sevens and 11s on the dice table, and the shooter wins. Terrorists use mass murder to create fear and chaos. If the public begins to dread seven and 11 on the calendar, international terrorists will consider that a psychological victory.