Why the rivalry between ISIS and al-Qaeda may lead to attacks on America

As al-Qaeda splits and morphs and into different affiliates and offshoots, U.S. counterterrorism officials worry about what one calls a “potential competitive dynamic” in which different factions — including the Islamic State of Iraq and Syria, now sowing civil war in Iraq — seek to bolster their credibility by attacking the United States. This new danger of attacks on the U.S. homeland is what concerns the Obama administration most about the splintering process that has created ISIS, a group so extreme that it has been denounced by Ayman Zawahiri, the nominal leader of the core al-Qaeda group.

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