Syrian Observatory for Human Rights says the overnight raids targeted Yarmouk Palestinian refugee camp and a small enclave south of the capital Damascus under the control of militants.
The United States, France and Britain launched military strikes in Syria in response to an alleged chemical attack in Syria's Douma, blamed by the US and its allies on Bashar al Assad's regime in Syria.
But Syria's UN ambassador refuted regime media reports that chemical inspectors had entered Douma, saying that UN security experts were preparing the way for the OPCW inspectors to look into alleged attack.
French President Emmanuel Macron said on Sunday that he persuaded Trump to leave US troops in Syria, but the White House says otherwise.
Regional powers Saudi Arabia and Iran have for decades been locked in a struggle for supremacy that is now being played out in proxy wars in several countries, including Yemen and Syria.
Foreign Minister Boris Johnson said there were currently no plans for further attacks in Syria after Britain and its allies France and the US launched air strikes on the regime's chemical weapons facilities.
Moscow slams the strikes as "aggressive actions" of the Western coalition, as the UN Security Council rejects Russia's draft resolution condemning the US-led strikes in Syria.
The US missile strikes offer no guarantee if they will cause serious damage to Bashar al Assad’s chemical weapons infrastructure.
The United States, Britain and France launched strikes against the Syrian regime in response to an alleged chemical weapons attack after mulling military action for nearly a week.
Striking the Syrian regime for the chemical attack in Douma has come too little, too late, and is not likely to deter the Assad regime or Russia. Worse still, a Trump-Bolton White House inspires little confidence in any large scale US intervention.
"Syria today is the most serious threat, and there is no military solution to the conflict," UN Secretary-General Antonio Guterres tells the UN Security Council. Meanwhile, Russia and the US trade accusations over suspected chemical attack in Syria.
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