Syria has not confirmed it has non-conventional weapons, and insists it would never use such arms against its own people. U.S. officials say intelligence suggests the government does have the weapons and has moved some of its stockpiles in recent days.
U.N. Secretary-General Ban Ki-moon renewed a call for Syria not to use chemical weapons, saying Friday the move would amount to an "outrageous crime" against humanity.
Speaking to reporters after visiting Syrian refugee camps in Jordan and Turkey, he also called for an end to the violence.
"The slaughter in Syria must stop," Ban said. "The military path is a dead end. It only fills the streets with more blood."
Associated Press writers Zeina Karam in Beirut, Albert Aji in Damascus, Suzan Fraser in Ankara and Mike Corder in the Netherlands contributed to this report.
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