British companies sold sodium fluoride, a key ingredient in the manufacture of the deadly nerve gas sarin, to a Syrian firm from 2004-2010, British media reveal, a sale that has been called ‘disturbing’ following the chemical weapons attack in Damascus.

Between July 2004 and May 2010, the British government issued five export licenses to two companies, allowing them to sell Syria sodium fluoride, necessary for the production of sarin, according to a report in the Daily Mail, a British daily.