A senior Revolutionary Guards commander denied that Iranian targets had been hit late on Saturday and said its military “advisory centers have not been harmed”, the semi-official ILNA news agency reported.

The Israeli military said its aircraft struck “Iranian Quds Force operatives and Shiite militias which were preparing to advance attack plans targeting sites in Israel from within Syria over the last number of days”, Reuters reported on Sunday. The Quds Force is the extra-territorial arm of Iran’s Islamic Revolutionary Guards Corps.

Lieutenant-Colonel Jonathan Conricus, an Israeli military spokesman, told reporters “a number of attack drones”, each armed with several kilograms of explosives, were to have been launched simultaneously at targets in northern Israel on Thursday but the plan was thwarted.

He did not disclose what measures Israel took that day. He described the “killer drones” – designed to slam into targets – as highly accurate. The Israeli military released grainy black-and-white surveillance footage purporting to show the Iranian operatives on Thursday near the drones’ launching site.

In the footage, four people are seen walking in an open area, one of them carrying an object that the military identified as a killer drone.

Conricus said the drones, accompanied by the Iranian operatives, had arrived at Damascus airport from Iran several weeks ago and were taken to a Quds Force-controlled compound in a village southeast of the city.

Israel carried out Saturday’s attack, Conricus said, after learning that another attempt to launch drones was imminent.

Writing on Twitter after Saturday’s Israeli strike, Prime Minister Benjamin Netanyahu said: “Iran has no immunity anywhere. Our forces operate in every sector against the Iranian aggression. If someone rises up to kill you, kill him first.”

Speaking on Sunday on the Syrian front, Netanyahu added: “Any country that allows its territory to be used for attacks against Israel will face the consequences, and I repeat, the country will face the consequences.”

In a call with Netanyahu, U.S. Secretary of State Mike Pompeo expressed Washington’s support for Israel’s right to defend itself against threats posed by the IRGC, according to the State Department.

“The secretary and the prime minister discussed how Iran is leveraging its foothold in Syria to threaten Israel and its neighbors,” State Department spokeswoman Morgan Ortagus said in a statement.

A war monitor said on Sunday that two members of Tehran-backed Lebanese militia Hezbollah and one Iranian were killed in the Israeli attack.

Hezbollah’s leader Hassan Nasrallah said two Lebanese nationals were killed in the strike which he said targeted Hezbollah positions.

Syrian state media said Syrian air defenses intercepted “hostile targets” over Damascus, the capital, on Saturday night. Witnesses in Damascus said they heard and saw explosions in the sky.