But, with the British government now estimating that the death toll from the attack has risen to 75, US President Donald Trump and other western leaders are contemplating punitive military action.
U.S. Ambassador to the United Nations Nikki Haley holds photographs of victims during a meeting at the United Nations Security Council on Syria at the United Nations Headquarters in NY. The Syrian government said it would facilitate the mission's investigation. On Thursday he met with his National Security Council and spoke by phone with the top leaders of Britain and France, who have indicated they want to punish Syria. But she says, "No final decision has been made".
A child receiving oxygen through respirators following an alleged poison gas attack in the rebel-held town of Douma, near Damascus, Syria. We thank them both.
Western leaders have made clear the alleged toxic gas strike on the Damascus suburb of Douma must not go unanswered - despite a warning from the United Nations secretary-general that the crisis could trigger a "full-blown military escalation".
When asked about his greatest worry if the USA strikes Syria again, the defense secretary cited civilian casualties.
Hamza Bayraqdar, spokesman for Jaysh al-Islam, the main rebel group that once controlled Douma, said his fighters had all evacuated.
In the UK, Cabinet ministers said that it was "highly likely" the Assad regime was responsible for the attack.
This signaled the end of one of the bloodiest assaults of the seven-year war and a major win for the Assad regime.
May said there was "no practicable alternative" to the use of force against Assad.
Mr Nebenzia said: "You only have a sole interest to oust the Syrian government and more broadly to contain the Russian Federation". He criticized Russian Federation for what he suggested was its failure to ensure the elimination of Syria's chemical weapons arsenal under terms of a 2013 agreement.
"The facility which was struck is located some distance from any known concentrations of civilian habitation, reducing yet further any such risk", it added. May "on the need to take action and deter the further use of chemical weapons".
The military drumbeat appeared to reach crescendo ahead of the meeting, with U.S. action seeming imminent as Russian Federation stonewalled diplomatic efforts at the United Nations and France cited "proof" that Moscow's Syrian ally carried out a deadly chemical weapons attack.
"Even if he (Trump) fires what he calls smart bombs, at us they will be stupid bombs because they will backfire on him and Syrians will be stronger", al-Issa said. Sullivan and Johnson agreed that based on reports in the media and from the ground, "this attack bore hallmarks of previous chemical weapons attacks by the Assad regime", the British foreign office said.
Israel is determined to prevent any lasting military settlement of Iranians in Syria and has already conducted operations against Iranian positions in the country.
Asked whether she could say that the United States has proof that Assad's regime was behind the strike, Nauert said: "Yes".
He said that "intelligence agencies of a state that is now striving to spearhead a Russo-phobic campaign were involved in that fabrication".
Britain's ambassador to the United Nations, Karen Pierce, dismissed Konashenkov's claim as "a blatant lie". "We're looking very, very seriously, very closely at the whole situation", he told reporters.
"I would like to take this opportunity to state categorically that".
"The norms against chemical weapons must be upheld".
The Russian military claims the alleged attack was staged and directed by Britain.
There has been increasing controversy over whether the worldwide community should get involved in increasing violence in Syria, which recently culminated in a suspected deadly gas attack.