Israel's attack on Iran raises questions like whether the US will get involved, how Iran will respond, and if a wider conflict may be triggered.

Blasts rang out across a swath of the Middle Eastern republic’s territory, targeting its nuclear capabilities, military leadership and scientists.

Israel on Saturday threatened to strike "every target of the ayatollah regime" in Iran, whose president warned of a severe response if the Israeli attacks continue, fuelling fears of an escalating conflict.

Sirens sounded in Israel as Iran launched dozens of ballistic missiles in retaliation for Israel's strikes on its nuclear facilities.