International law prohibits the use of white phosphorous shells in heavily populated civilian areas
Executive Council is the principal policy-making organ of Organization for the Prohibition of Chemical Weapons
Diplomats say that a compromise now appeared to be on the cards
A top US envoy says there is evidence that chemical weapons were being prepared by Syrian government forces in Idlib
The White House warns that US and its allies would respond if Syrian forces used chemical weapons
Demands an independent investigation into the matter and gross violation of human rights
According to Syrian medics and World Health Organisation, more than 40 people died in an April 7 strike on Douma
Inspectors from the Organisation for the Prohibition of Chemical Weapons (OPCW) are due to start work in Douma soon
Russia has trashed the credibility of the council, says Nikki Haley
Experts speculate that retaliatory strikes would focus on facilities linked to reports of chemical weapons attacks