Marine Gen. Joseph Dunford, chairman of the Joint Chiefs of Staff, was asked at a Senate Armed Services Committee hearing Thursday about the disclosure a day earlier that the Islamic State may have attacked Qayara West air base with chemical weapons.
U.S. officials had said Wednesday that an oily substance found on a fragment of the rocket that landed inside the security perimeter of the base initially tested positive for mustard agent, but that a second test was negative. They said further laboratory testing was scheduled.
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