A senior Revolutionary Guards general threatened on Thursday to target Israel’s “nuclear facilities” if it strikes Iranian atomic sites, state media reported, anticipating retaliation for Tehran’s unprecedented weekend attack.

Israel’s military chief has vowed a response to the Iranian aerial attack, which was mostly intercepted, while world leaders have urged de-escalation.

Tehran’s first direct attack on Israel, launched late Saturday, was in retaliation for an April 1 air strike on the Iranian consulate in Damascus that killed seven members of the Islamic Revolutionary Guard Corps, including two generals.

Israeli officials have not said when or where the country would retaliate, but Ahmad Haghtalab, the Guards’ head of nuclear protection and security, said Iran would “definitely” reciprocate any attack on nuclear sites.