The unit, known as Alec Station, was disbanded late last year and its analysts reassigned within the C.I.A. Counterterrorist Center, the officials said.
The decision is a milestone for the agency, which formed the unit before Osama bin Laden became a household name and bolstered its ranks after the Sept. 11 attacks, when President Bush pledged to bring Mr. bin Laden to justice "dead or alive."
The realignment reflects a view that Al Qaeda is no longer as hierarchical as it once was, intelligence officials said, and a growing concern about Qaeda-inspired groups that have begun carrying out attacks independent of Mr. bin Laden and his top deputy, Ayman al-Zawahiri.
Agency officials said that tracking Mr. bin Laden and his deputies remained a high priority, and that the decision to disband the unit was not a sign that the effort had slackened. Instead, the officials said, it reflects a belief that the agency can better deal with high-level threats by focusing on regional trends rather than on specific organizations or individuals.
"The efforts to find Osama bin Laden are as strong as ever," said Jennifer Millerwise Dyck, a C.I.A. spokeswoman. "This is an agile agency, and the decision was made to ensure greater reach and focus."
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