The European Union's top diplomat Federica Mogherini says Syrian President Bashar al-Assad holds "primary responsibility", after a suspected gas attack killed at least 58 people.
She was speaking on the eve of a international conference on Syria due to start on Wednesday in Brussels.
Our Brussels correspondent Kevin Ozebek says she is frustrated by the lack of progress on finding a solution to the Syrian civil war
IN: "Even though..."
OUT: "...refugee crisis"
DUR: 18"
Our Brussels correspondent Kevin Ozebek says the UN Special Envoy to Syria, Stefan de Mistura is frustrated by Russia blocking what the UN can do in Syria
IN: "We also then..."
OUT: "...veto power"
DUR: 24"
Our Brussels correspondent Kevin Ozebek looks ahead to the conference
IN: "representatives from..."
OUT: "...this war"
DUR: 24"