The United States has dismissed Syrian claims accusing it of attacking a Homs air base.
"However, we continue to closely watch the situation and support the ongoing diplomatic efforts to hold those who use chemical weapons, in Syria and otherwise, accountable".
An alleged chemical attack carried out by the regime of President Bashar Al Assad occurred in Douma, a Damascus suburb, on Saturday, killing an estimated 40.
The semi-official Fars news said on Monday that four "defenders of the shrine" were killed in the air strike.
The fast-paced developments threatened to further hike tensions between the US and Russian Federation, which has in the past warned against any USA military action against President Bashar Assad's government.
Russian U.N. Ambassador Vassily Nebenzia said on Monday that Moscow has warned the United States of "grave repercussions" if it carries out an attack against Syrian government forces over reports of a deadly chemical weapons attack.
The Syrian Observatory for Human Rights, a British-based monitor, said at least 14 people were killed including some fighters of various nationalities, a reference to Iranian-backed Shi'ite militia members, mostly from Iraq, Lebanon and Iran fighting alongside the Syrian army.
The Syrian government launched a fierce air and ground assault on Douma, the last rebel-held town in the eastern Ghouta district, last Friday.
Earlier, President Donald Trump promised a "big price to pay" for the weekend's suspected chemical attack.
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Former US President Barack Obama had once said that the use of chemical weapons, which is banned under global treaties, which Syria remains a part of, was a "Red Line" for the US' strategy in the Syrian Civil War.
Nebenzia alleged that the anti-government forces had chemical weapons and could stage an attack.
French President Emmanuel Macron spoke to Trump by telephone and the two agreed that they would work together to establish clear responsibility for what Macron's office said they had agreed was a confirmed chemical attack. "Douma city, April 7. there is a strong smell here", a voice can be heard saying.
United States government sources say Washington's assessment of Saturday attack was that chemical weapons were used.
Reuters could not independently verify the reports. Although the agency said it was likely "an American aggression", US officials said the United States had not launched any airstrikes on Syria.
The UN Security Council will meet twice on Monday following rival requests by Russian Federation and the United States to investigate the alleged chemical attack.
The European Union also laid the blame squarely on Assad's government. It says the other three landed in the western part of the T4 base.
"The numbers keep rising as relief workers struggle to gain access to the subterranean areas where gas has entered and hundreds of families had sought refuge", the group said.