Iranian missiles struck Israel's Tel Aviv and the port city of Haifa before dawn on Monday, killing at least eight people and destroying homes, prompting Israel's defence minister to warn that Tehran residents would "pay the price and soon," Reuters reported.

Iran said its parliament was preparing a bill to leave the Nuclear Non-Proliferation Treaty (NPT), adding that Tehran remains opposed to developing weapons of mass destruction. Passing the bill could take several weeks.

Israel is presumed to have a sizable nuclear arsenal but neither confirms nor denies it. It is the only Middle East state that has not signed the NPT.

Israel's military, which has gutted Iran's nuclear and military leadership with airstrikes, said on Monday it had killed four senior intelligence officials including the head of the Revolutionary Guards' intelligence organisation, according to Reuters.