After the liberation of Douma from terrorists, the Syrian army found their labs, where they allegedly produced chemical weapons. According to the Syrian envoy to the OPCW, the chemicals found there were produced in the UK's Porton-Down laboratory in Salisbury – the same one, which analyzed the Skripal case evidence.
Porton Down lab was opened in 1916 and at the time was called as the War Department Experimental Station (it's actually changed names a lot during its history) and was put in charge of testing chemical weapons and defenses against them in the light of German army using them in the First World War. However, what started as a lab, seeking protection from the most dangerous weapons for its soldiers, over time started producing even deadlier ones.
Gruinard Island Experiment
During the Second World War it was called Biology Department, Porton (BDP) was conducting research in deadly anthrax bacterium and into methods of weaponizing it. In 1942 BDP conducted a field test of its anthrax bioweapon. Since it was expected that a test site would be exposed to a long-lasting contamination by the anthrax spores an inhabited and remote island was chosen — Gruinard Island.
Army Finds Terrorist Depots With Chemicals Produced in UK, Germany — Damascus
The experiment was “highly successful” — all 80 test sheep died within days after the weapon was used and the island was largely contaminated…