Following another chemical attack in Syria on Saturday, The United Nations Security Council is expected to hold an emergency meeting on Monday, according to the United Kingdom Mission to the U.N.

Dozens of people are to have been affected by the attack, with several activist groups reporting that at least 42 civilians have died from the deadly chemical;s allegedly released in the rebel-held city of Douma in Eastern Ghouta, Syria.

The Syrian government has been accused of releasing the chemical agent, but they deny doing so.

The U.K. Mission tweeted: “UK, France, US, Poland, Netherlands, Sweden, Kuwait, Peru and Cote d’Ivore have called an emergency meeting of #UNSC to discuss reports of chemical weapons attack in #Syria. Meeting expected on Monday.” (See tweet below.)

The Washington Examiner reports: The U.N. Security Council is made up of five permanent members: the United States, U.K., China, France and Russia.

Bolivia, Cote d’Ivoire, Equatorial Guinea, Ethiopia, Kazakhstan, Kuwait, Netherlands, Peru, Poland, and Sweden are also non-permanent members.

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Syria’s state news agency denied allegations that the Assad regime was behind the attack, saying reports were a “blatant attempt to hinder the army’s advance” into a “collapsing terrorist” stronghold.

President Trump warned there will be a “big price” to pay following reports of the attack, said Russia and Iran are “responsible” for backing Syrian President Bashar Assad.

A statement from U.N. spokesman Stéphane Dujarric said, “any use of chemical weapons, if confirmed, is abhorrent, and requires a thorough investigation.”

The Examiner further reports: The U.S. State Department spokeswoman Heather Nauert said the “Assad regime and its backers must be held accountable and any further attacks prevented immediately” and issued a direct warning to Russia, the Syrian government’s staunchest backer.

“Russia, with its unwavering support for the regime, ultimately bears responsibility for these brutal attacks, targeting of countless civilians, and the suffocation of Syria’s most vulnerable communities with chemical weapons,” she said.

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