No additional strikes against the Assad regime were planned for the time being, Defense Secretary Jim Mattis said, following Dunford's comments.
Russian Federation is likely to call for a meeting of the United Nations Security Council to discuss US, British and French air strikes on Syria, one of its lawmakers says. It was not immediately clear if Russian-supplied interceptors were activated.
Meanwhile, Russia's Embassy to the United Kingdom tweeted a statement by the Ministry of Foreign Affairs' spokeswoman, Maria Zakharova, that denied there was any evidence of a chemical attack. "Again, we are being threatened".More news: ALERT: Winter Weather Advisory for ALL of CNY
U.S. President Donald Trump warned on Wednesday that missiles "will be coming" in response to the toxic gas assault on April 7 that killed dozens of people in Douma, a town near Damascus which had been held by rebels until this month.
The prospect of Western military action in Syria that could lead to confrontation with Russian Federation hung over the Middle East on Friday but there was no clear sign that a US-led attack was imminent.
Overnight, US, British and French forces launched more than 100 missiles from ships and manned aircraft, targeting three of Syria's main chemical weapons facilities.More news: Woman missing after fall from cruise ship
"To Iran and to Russian Federation, I ask: what kind of a nation wants to be associated with the mass murder of innocent men, women and children?"
The Syrian government has also categorically denied the accusation.
The US and its allies attacked Syria shortly before the Organisation for the Prohibition of Chemical Weapons (OPCW) mission was expected to begin its work in the town of Douma.More news: Vettel flies to pole as Hamilton struggles at Chinese Grand Prix
The Reuters news agency is reporting that multiple blasts were heard in the Syrian capital Damascus and that smoke is rising from the eastern part of the city. US defense officials did not confirm if any allied missiles had been shot down.