The United Nations' nuclear watchdog said it had been trying to contact Iran's nuclear regulatory authorities "with no response so far". VIENNA: The head of the UN's nuclear watchdog said on Monday (Mar 2) the situation in the Middle East was "very concerning", urging "utmost restraint" after Israeli-US strikes on Iran and its retaliatory missile attacks. IAEA chief Rafael Grossi also said up to now his agency had "no indication" that any of the nuclear installations have been damaged or hit in