The assessment notes eight chlorine attacks ahead of the "major attack" on Douma and 44 allegations of chemical weapons use in Syria over the past year. "The United States and its allies have no proof and, without even waiting for the Organisation for the Prohibition of Chemical Weapons to take a position, have carried out this military attack", said the foreign ministry in a statement. "It is not about regime change", May said in statement made from her country residence at Chequers just minutes after U.S. President Donald Trump announced the strikes from the White House.
"This is the first time as prime minister that I have had to take the decision to commit our armed forces in combat - and it is not a decision I have taken lightly", she said.
Israeli planes then struck an Iranian installation in Syria from which, the IDF explained, the unmanned aircraft had been operated.
Iran's involvement in Syria in support of President Bashar al-Assad has alarmed Israel, which has said it would counter any threat.
"This is unprecedented in seven years: that Israel directly targets Iran's Revolutionary Guards", Nasrallah said. "The American, French presidents and the British Prime Minister are criminal", he said.
In a statement, the Iranian Foreign Ministry said the US and its allies "will assume the responsibility for the regional and trans-regional consequences of this adventurism".
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Iran and Russian Federation have both been close allies of Syria's Assad, with Moscow providing military support for the Syrian government amid a years-long civil war there. Joseph Dunford, Washington's top general, said the "precision strikes" hit three targets: A scientific research centre near Damascus that is allegedly connected to the production of the chemical weapons; a chemical weapons storage facility near Homs; a command post near the capital.
The Syrian government has strongly denied the allegations. "We thank them both", Trump added. "We were expecting at least more airfields, ground force and naval bases to come under attack", said Arash Aramesh, a national security and foreign policy analyst.
The attacks were described by the Pentagon as precise and aimed exclusively at the regime's chemical weapons facilities.
He says the Russian air defense assets in Syria monitored the strike but didn't engage any of the missiles.
Iran's Supreme Leader Ayatollah Ali Khamenei gestures before delivering a speech in Mashad, Iran, March 21, 2018.
Trump said that the objective of the response "is to establish a strong deterrent against the production, spread, and use of chemical weapons", Trump said.
"Insulting the President of Russian Federation is unacceptable and inadmissible".