The European Union says the Syrian government was the likely perpetrator of the Damascus chemical attack on August 21, but that it will not be rushed into any military action before an official UN report is released.

"Information from a wide variety of sources confirms the existence of such an attack and seems to indicate strong evidence that the Syrian regime is responsible for this attack," EU foreign policy chief Catherine Ashton said in a statement following a meeting between European foreign ministers and US Secretary of State John Kerry in the Lithuanian capital Vilnius on Saturday.

"In the face of this cynical use of chemical weapons, the international community cannot remain idle. A clear and strong response is crucial to make clear that such crimes are unacceptable and that there will be no impunity," Ashton said.

The United States says that Syria’s official forces unleashed a gas attack on a Damascus suburb last month, killing over 1,400 civilians. The White House, which previously designated chemical warfare as a“red line,” is calling for “limited” action against the Assad regime – likely a series of air strikes. 

The European Union nonetheless urged the United States to respect “the UN process.” A United Nations expert team toured the site of the alleged attack in its aftermath. French President Francois Hollande has said that the preliminary results of the report will be presented by the end of next week. The inquest is likely to identify the substance of the attack – suspected to be sarin nerve gas - and its scale, but may not say at whose behest it was executed. 

Kerry, who traveled to Vilnius specifically to garner European support, said he was “grateful” for “a strong statement about the need for accountability” from the EU’s 28 members. He also stated that Barack Obama has not himself decided whether it is necessary to wait until the UN report before taking action, though in any case it is likely its contents will be revealed before Congress has a chance to vote on the Syria intervention. 

Opinion on the effectiveness of a potential strike runs a wide gamut across Europe. 

French Foreign Affairs Minister Laurent Fabius (R) and US Secretary of State John Kerry give a press conference at the ministry in Paris, on September 7, 2013. (AFP Photo)

Over the past fortnight, France and the UK have led calls for military response. Italy and Spain have assumed a waiting position, while Germany has proceeded with caution.  

On Saturday, Hollande said he will wait for UN expert conclusions before deciding his next move – news which contrasts with his previous statements. Meanwhile, Germany became the eleventh G20 member to sign a petition demanding a “strong” response to the alleged actions of the Assad government. 

The European Union also declared that the UN International Criminal Court (ICC) in The Hague should investigate any Syrian officials involved in the incident. But the ICC will not act without unanimous approval from the UN Security Council, and that is unlikely to be obtained. 

Russia and China have repeatedly blocked Western-backed resolutions in the Security Council throughout the 30-month conflict. 

During the G20 summit in St. Petersburg on Friday, Russian President Vladimir Putin said that the Syrian rebels - not the government - were behind the attack. He also said that Russia would offer military support to the Assad regime in case of a strike. 

Kerry will now travel to Paris and London in an attempt to win endorsement for US military action from Arab leaders, including Palestinian President Mahmoud Abbas. 

According to UN estimates, at least 100,000 people have been killed since the uprising against Bashar Assad began in March 2011. 

• A Permanent Economic Emergency