The risk, analysts say, is that the US would then end up in a cycle of escalation that entangles the American military more deeply in the Syrian conflict than the administration intended.
President Trump did not specifically state the targets but did say the targets were associated with chemical weapon capabilities.
May said Britain and the West had an obligation to deter both Assad and others from using chemical weapons after the poison gas attack in Douma near Damascus killed up to 75 people including children. "We confined it to the chemical weapons-type targets".
"And a significant body of information including intelligence indicates the Syrian regime is responsible for this latest attack".
"They were largely ineffective and increased risk to their own people", he said.
Syria state TV, however, claimed that three civilians were wounded in Homs after "several" missiles were intercepted by Syrian air-defense systems.
"Never said when an attack on Syria would take place".
According to the Russian military, the massive missile strike on objects of military and civilian infrastructure was conducted by USA warships jointly with the United Kingdom and French air forces at 3:42-5:10 Moscow time. "We look forward to the day we can bring our warriors home", he said.
"A perfectly executed strike last night", Trump tweeted Saturday. Assad and Russian Federation have denied roles in the attack.
US President Donald Trump announced the decision to launch air strikes on Syria's chemical weapon facilities last night.
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Trump has long criticized his predecessor Barack Obama for failing to enforce a "red line" in 2013 after earlier chemical attacks blamed on Assad's forces.
She explained a storage facility, military bunker and a chemical weapons research facility were among the targets of a join operation with the United States and France's military.
"We are not looking for confrontation and refuse any logic of escalation, that is the reason why we, with our allies, ensured the Russians were warned beforehand", Parly said.
Speaking to reporters after the NSC meeting, Foreign Minister Taro Kono denied that the wording of Japan's message of support means it holds a different attitude from the United States and other allies.
Secretary-general Antonio Gutteres condemned the use of chemical weapons but sought to reduce tension.
"I urge all Member States to show restraint in these unsafe circumstances and to avoid any acts that could escalate the situation and worsen the suffering of the Syrian people", he said.
"If we can't determine who used (the chemical weapons), it's hard to support the strikes themselves", a government source said.
Trump, French President Emmanuel Macron and U.K. Prime Minister Theresa May released statements after the attack had begun, saying the missile strikes were focused on chemical weapons sites.
"We thought it would be much bigger than this", said Ahmed Primo, a journalist and activist now living in the Turkish city of Gaziantep.
"All responsibility for them rests with Washington, London and Paris".
White said the US does not seek conflict with Syria but "cannot allow such grievous violations of worldwide law" and attacks on innocent Syrians.