U.S. intelligence and security agencies say the plot by Al Qaida in the Arabian Peninsula to blow up airliners was first discovered Oct. 28 and was preceded by growing indicators that Islamist terrorists were stepping up activities both abroad and in the United States. U.S. officials trying to connect the dots of several recent incidents say four shootings by unidentified gunman at the Pentagon and military facilities in the Washington area is one of several signs.

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