US Official: "A higher degree of radical Islamist penetration in Syria ..."

"... The administration, officials said, that the rebels have made steady progress, using provided and paid for by Persian Gulf states. But U.S. officials worry that any weapons given to shoot down Syrian planes or attack government tanks might fall into the hands of extremists within a rebel movement... “We worry that there is a higher degree of radical Islamist penetration in Syria, and we don’t want weapons falling into the wrong hands later,” said a third senior administration official involved in the planning for a post-Assad Syria... "