Unverified pictures purport to show smoke rising from Damascus, Syria
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Syria unrest: Reports of heavy fighting around Damascus

Fighting is intensifying across the Syrian capital Damascus, where the military has deployed tanks and helicopters, activists say.

Rebel forces say they have launched an all-out assault on the capital, calling it Operation Damascus Volcano.

UN envoy Kofi Annan has held talks with Russian President Vladimir Putin in Moscow over the crisis.

Meanwhile, Foreign Secretary William Hague visited a camp for Syrian refugees in Jordan, and the BBC's Rupert Wingfield-Hayes was with him.

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