Israel has carried out air strikes in western and central Iran after Iran fired missiles at northern Israel.
It's the first time the two countries have launched attacks on each other's territory since a ceasefire came into force two months ago.
Iran's Islamic Revolutionary Guard Corps (IRGC) said the operation was "not a passing event" but "the beginning of a full week of continuous strikes".
Earlier on Sunday, Israel also struck Lebanon's capital, Beirut, saying it was responding to Hezbollah fire targeting northern Israel.