Israel’s historic strike on Iran revealed years of Mossad activity inside the country, including hidden weapons, drones and assassinations of nuclear officials.

Hossein Salami, commander of Iran’s Islamic Revolutionary Guard Corps, was killed in Israel’s attack on the Islamic Republic, according to people familiar with the matter and Iranian media.

“We are fully prepared for any scenario, under any circumstances,” he said.

Crowds of demonstrators rallied in Tehran calling for retaliation after Israeli strikes on Iran and questioning whether the country should continue negotiations with the United States over a potential nuclear deal.

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The decision by the U.S. to evacuate some personnel comes at a volatile moment in the region.