Much of the information that led the authorities to raise the terror alert at several large financial institutions in the New York City and Washington areas was three or four years old, intelligence and law enforcement officials said on Monday. They reported that they had not yet found concrete evidence that a terrorist plot or preparatory surveillance operations were still under way.
But the officials continued to regard the information as significant and troubling because the reconnaissance already conducted has provided Al Qaeda with the knowledge necessary to carry out attacks against the sites in Manhattan, Washington and Newark. They said Al Qaeda had often struck years after its operatives began surveillance of an intended target.
Taken together with a separate, more general stream of intelligence, which indicates that Al Qaeda intends to strike in the United States this year, possibly in New York or Washington, the officials said even the dated but highly detailed evidence of surveillance was sufficient to prompt the authorities to undertake a global effort to track down the unidentified suspects involved in the surveillance operations.
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