The Daily Mail deleted this story in 2013:
Allegedly the chemical company mentioned in the story sued the paper into deleting story. It is available on the Wayback Machine (link).
Hillary Clinton resigned as Secretary of State days after the story broke.
SIDENOTE ON APRIL 5, 2017 CHEMICAL WEAPON ATTACK:
Somehow, film crews without safety gear, with HD cameras, were able to stream live from the war torn area quickly, showing rescuers without gloves helping victims of Sarin gas attacks.