The U.S. bombing campaign in Iraq and Syria has failed to slow the pace of foreign fighters flocking to join the Islamic State and other extremist groups, including at least 3,400 from Western nations among 20,000 from around the world, U.S. intelligence officials say in an updated estimate of a top terrorism concern.
Intelligence agencies now believe that as many as 150 Americans have tried and some have succeeded in reaching the Syrian war zone, officials told the House Homeland Security Committee in testimony prepared for delivery on Wednesday. Some of those Americans were arrested en route, some died in the area and a small number were still fighting with extremists.
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