Under growing pressure from U.S. missile strikes, the al-Qaida terror network is relying more heavily on local insurgent groups along the Pakistan border to house training camps that are growing smaller and more mobile, according to counterterrorism officials and analysts.

The changes in the terror group’s training operations — often hidden inside walled compounds deep in Pakistan’s mountains — have made them increasingly difficult to target by U.S. intelligence forces as they have stepped up drone attacks over the past year.

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