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UN experts confirmed the use of the nerve agent sarin but they were not asked to ascribe any blame.

UN experts confirmed the use of sarin but they were not asked to ascribe any blame.

The US launched missiles at a Syrian Air Force base where the Pentagon said a warplane had taken off before dropping bombs filled with the nerve agent sarin on the rebel-held town of Khan Sheikhoun.

The potential for wider terrorist threats was considered most likely to come from chemical or biological attacks - "the main risks identified here are anthrax, smallpox, botulism and nerve gases such as sarin", the file said.

Its methodology has been used to support the Syrian Archive’s submission of evidence to investigative and prosecute authorities in Germany, France, and Sweden about the 2013 sarin gas attack on Khan Shaykhun.