Members of the UN investigation team take samples from sand near a part of a missile that is likely to be one of the chemical rockets according to activists
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Can Syria's chemical arsenal be 'hunted down'?

10 September 2013 Last updated at 17:42 BST

Russia has claimed it has a "concrete plan" to put Syria's chemical weapons under international control.

The country's foreign minister Sergei Lavrov said Moscow was "preparing a concrete proposal which will be presented to all interested sides, including the US".

Frank Gardner reports.