WASHINGTON- US intelligence officials are looking into the possibility that chemical weapons may have been used in Syria in a limited form, although there is no consensus yet and additional analysis is required, a senior US official said on Thursday.

"More review is needed," the senior US official told Reuters, speaking on condition of anonymity.

The disclosure came as the US Director of National Intelligence James Clapper said at a Senate hearing that the Syrian regime of President Bashar Assad "appears quite wiling to use chemical weapons against its own people."

"We receive many claims of chemical warfare use in Syria each day and we take them all seriously, and we do all we can to investigate them," Clapper said.

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