Al-Qaeda Resurgence Sparks U.S. Concern.

An Al-Qaeda resurgence in Pakistan's tribal areas has raised deep concerns in the United States, which reportedly is pondering unilateral military strikes in a reflection of increasing impatience over Islamabad's counterterrorism strategy.

US military chief Admiral Michael Mullen last week expressed "grave concern" over Al-Qaeda's use of the Pakistani tribal areas as safe havens, saying they posed a "significant" security threat to Afghanistan and Pakistan itself.

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