The CIA is deploying teams of spies, analysts and paramilitary operatives to Afghanistan, part of a broad intelligence "surge" that will make its station there among the largest in the agency's history, U.S. officials say.

When complete, the CIA's presence in the country is expected to rival the size of its massive stations in Iraq and Vietnam at the height of those wars. Precise numbers are classified, but one U.S. official said the agency already has nearly 700 employees in Afghanistan.