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Talks at the United Nations over a response to the crisis in Syria will continue "over the coming days", Foreign Secretary William Hague said but he acknowledged that a new resolution was unlikely.
With Russia and China expected to veto any Security Council resolution for action against Syria, Mr Hague insisted the international community still had a responsibility to act even if agreement could not be reached in New York.
Mr Hague said: "This is the first use of chemical warfare in the 21st century. It has to be unacceptable. We have to confront something that is a war crime, something that is a crime against humanity.
"If we don't do so we will have to confront even bigger war crimes in the future and so we continue to look for a strong response from the international community that is legal, that is proportionate and that is designed to deter the further and future use of chemical weapons."
Discussions over the crisis in Syria will continue at the United Nations "over the coming days", Foreign Secretary William Hague said but stressed the international community would still have a responsibility to act even if there could not be agreement at the UN.
Former Labour cabinet minister Peter Hain told the Guardian he felt intervening in Syria would be "very dangerous".
Mr Hain, who is poised to vote against the motion when Parliament meets tomorrow if he returns from a foreign trip in time, said: "The Prime Minister is asking the nation to back him on a dangerous strike when nobody knows what the consequences will be. I think that's very, very dangerous politics."
The Prime Minister's recommendation for action against the Assad regime will be considered by the Cabinet tomorrow after winning the unanimous support of the National Security Council, Number 10 has said.
The National Security Council's unanimous backing for a response to a suspected chemical weapons attack in Syria came a day after Prime Minister David Cameron set out the case for a targeted military strike on the Assad regime.
Prime Minister David Cameron has said the National Security Council was unanimous in agreeing to pursue action against the Assad regime following last week's alleged chemical attack in Syria.
David Cameron's emergency talks in Downing Street over possible military action against Syria have finished.
The Prime Minister was joined by senior military and security chiefs, including the head of Britain's armed forces, General Sir Nick Houghton, and MI6 chief Sir John Sawers.
The meeting of the National Security Council also saw a number of key Cabinet figures, including Defence Secretary Philip Hammond, Attorney General Dominic Grieve and Deputy Prime Minister Nick Clegg.
Scotland's First Minister, Alex Salmond, has said the case for military action in Syria has not yet been made.
"The Scottish Government condemns unreservedly the actions of the Assad regime over recent months and years," Mr Salmond said in a statement, adding: "We condemn and deplore any use of chemical weapons by any party as a crime against humanity."
But he said the international community must give UN inspectors time to complete their investigations before acting "within a clear legal framework" if military action is deemed justified.
Latest ITV News reports
The Prime Minister has said 'the world should not stand idly by' after hundreds were killed in apparent chemical attacks in Syria last week.
Any UK military action in Syria would involve submarine-launched cruise missiles rather than air strikes, a military expert has predicted.