Iran’s semi-official news agency FARS reported Monday that three Islamic Revolutionary Guards Corps troops were among the 14 personnel reported killed in a missile strike on a Syrian airbase overnight. Two U.S. officials confirmed to NBC News that Israeli warplanes struck a Syrian airbase and that the White House was informed about the attack in advance. The airstrikes followed international condemnation of a suspected chemical attack Saturday on a rebel-held town by Syrian President Bashar al-Assad’s government forces. The Tiyas airbase near the city of Homs is also known as T4 and was also the target of last year’s airstrikes ordered by President Trump. Syrian state news initially said the U.S. was “most likely” behind the attack, before Russia named Israel as the attacker; Syrian spokespeople then changed their assessment to also blame Israel. In February, Israeli officials said Iranian drones launched from the site crossed into its airspace. On Sunday, President Trump warned there would be a “big price to pay” for the suspected gas attack on the rebel-held town of Ghouta that is believed to have killed at least 40 people, including children.