Iran has warned it will ramp up its nuclear activities after the United Nations nuclear watchdog’s 35-member board of governors adopted a resolution Thursday declaring it in breach of its non-proliferation obligations.

Iran's foreign ministry and the Iranian nuclear agency rejected the report, calling it "politically motivated" in a joint statement.

Western nations are planning to table a resolution at an IAEA meeting that will find Iran in non-compliance with its so-called safeguards obligations for the first time in 20 years, a senior western diplomat said.

Before Israeli strikes on Friday, Washington and Tehran had held several rounds of talks on Iran's nuclear programme, as concerns mounted about its rapid expansion. Iran has significantly ramped up its nuclear programme in recent years,

Iran criticized a new report by the UN nuclear watchdog accusing it of nuclear violations, claiming the agency is motivated by politics and reiterating it isn’t seeking atomic weapons.

Air raid sirens sounded in Tel Aviv and Jerusalem, Israel's two largest cities, sending residents rushing into shelters as successive waves of Iranian missiles streaked across the skies. The military said its air defence systems were operating.

Iran carried out secret nuclear activities with material not declared to the UN nuclear watchdog at three locations that have long been under investigation, the watchdog said in a wide-ranging, confidential report to member states seen by Reuters.

The IAEA later confirmed that while external radiation levels around Natanz had not increased, internal contamination was detected.