At least 21 people, including children, suffered breathing difficulties Monday, a monitor said, in a suspected Syrian regime chemical attack on a besieged rebel enclave near Damascus.

United Nations inspectors have accused President Bashar Assad's regime of being behind multiple deadly poison gas attacks during the country's devastating seven year war.

Days later, Human Rights Watch head Kenneth Roth accused the Syrian regime of using chlorine gas during the siege of Eastern Ghouta.

The attack triggered an unprecedented American missile strike on the airbase it is believed Syrian forces used to carry out the attack.

The regime is also accused of using chlorine gas in three areas of northern Syria in 2014 and 2015 .

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