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'Neurotoxic' attack in Syria

Medecins Sans Frontieres says doctors have treated about 3,600 patients in Syria with 'neurotoxic symptoms' and that 355 of them died. It suggests there are strong indications that chemical weapons have been used.

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Damascus is the 'chemical weapons capital' of Syria

Damascus is the "chemical weapons capital of Syria" and contains a "network of jealously protected weapons facilities," according to research by Channel 4 News.

Based on thousands of videos and social media updates, Channel 4 also reports that rebel groups have accused the government of 30 separate chemical attacks. The government has reportedly made only one such accusation.

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