This week the French announced the arrest of what appears to be an al-Qaida cell whose members were planning a chemical weapons attack on the Paris subway.

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An analysis of video of hospitalized Syrians released by state-run TV suggests people are not suffering from a chemical weapons attack, nor are they being treated as though they were in such an attack, the U.S. military official said.

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The document will say "there remains a narrow range of contingencies in which the option of using nuclear weapons can play a role in deterring large-scale conventional, chemical or biological attack, " he said.

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