There is a "high probability" that Syria used chemical weapons against opposition forces, though verification is needed, U.S. Rep. Mike Rogers, chairman of the House Intelligence Committee, said Tuesday.
The claims come amid pressure in the West to arm the rebels, long overmatched by the Syrian military and its allies.
The embattled government of President Bashar al-Assad on Tuesday accused rebels of a deadly chemical weapon missile attack on the town of Khan al-Asal in Aleppo province. The opposition has accused al-Assad's forces of using such weapons.
The civil war -- which began two years ago after a government crackdown on Syrian protesters -- has left around 70,000 people dead, the United Nations says, and uprooted more than 1 million people.
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