The European Union is squarely laying the blame for the suspected poison gas attack with Syrian President Bashar Assad’s government.

EU spokeswoman Maja Kocijancic said that over the weekend and early Monday as the reports came in of another atrocity in Syria, the EU “learned from several sources” to shape its conviction “that it is the Syrian regime which is responsible” when it comes to the suspected chemical attack.

The EU appealed in a statement on Sunday that Assad allies Russia and Iran “use their influence to prevent any further attack and ensure the cessation of hostilities and de-escalation of violence” as agree under a U.N. resolution.