Israeli Prime Minister Benjamin Netanyahu has said Israel "fully supports" the joint airstrikes on Syria by the US, Britain and France.
About 4,000 migrants have left Israel for Rwanda and Uganda since 2013 under a voluntary program, but Prime Minister Benjamin Netanyahu has come under pressure from his right-wing voter base to expel thousands more. The Douma attack killed over 40 people, with hundreds wounded by exposure to chemical agents.
"The important global message that came from the attack was zero tolerance for the use of non-conventional weapons", Netanyahu said at the start of a cabinet meeting, describing his discussion with May. "This morning the United States, France and the United Kingdom showed that their commitment is not limited to declarations of principles", he added in a statement.
Netanyahu warned Syrian President Bashar al-Assad that his "ceaseless efforts to acquire and use weapons of mass destruction. put Syria in danger".
The official said that Israel received the warning between 12 and 24 hours before the attack was carried out.
Two Israeli officials said on Sunday that they would continue to act to prevent Iran from establishing itself in Syria.
Asked whether Israel helped choose targets, the official, who spoke on condition of anonymity, said: "Not to my knowledge". Iran is the key backer alongside Russian Federation of Syrian President Bashar al-Assad, providing military advisors and "volunteer" ground forces.
Israel said on Friday that an Iranian drone shot down in February by its air force had been fitted with explosives intended.
Iran warned of "regional consequences" on Saturday following a wave of punitive strikes in Syria by the United States, Britain and France.
Netanyahu said Israel would not allow Iran to establish itself in Syria, according to his office. The coalition strikes reportedly caused heavy damage to Syria's chemical weapons infrastructure.