Mossad spy chief David Barnea praised his agents for their role in Israel’s operation against Iran, expressed gratitude to America’s CIA, and pledged ongoing vigilance in remarks broadcast on Wednesday.

“We will remain vigilant, keeping a close eye on all the projects in Iran, which we know of, in the deepest way. We will be there as we have been until now,” Barnea said in a video of his remarks to agents.

Israel sent Mossad operatives into Iran to destroy weapons systems, an Israeli security source told Reuters on June 13 at the start of a 12-day air war on Iranian nuclear and military targets that ended on Tuesday in a U.S.-brokered ceasefire.

“I want to express appreciation and recognition of our main partner – the CIA – for the joint activities,” Barnea said of the U.S. Central Intelligence Agency. He said the CIA had supported the Mossad and made the operation possible.

The Israeli security source in the June 13 Reuters report said Israel’s military and Mossad had worked for years on the intelligence needed for the airstrikes, which killed both commanders and nuclear scientists in Iran.

Israel’s military Chief of Staff, Lieutenant General Eyal Zamir said in a video broadcast on Wednesday night: “The Iranian nuclear program has suffered a harsh, broad and deep blow and has been set back years.”

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(Reporting by Howard Goller, Maayan Lubell and Emily Rose; editing by Diane Craft)