Iran must clarify the details of its nuclear program, the head of the United Nations's nuclear watchdog, Mohamed ElBaradei, said today.

Dr ElBaradei was speaking before the opening of a closed-door session of the IAEA's governing board.

The top item on the agenda is two IAEA reports on nuclear inspections in Iran.

The board is expected to call on Iran to allow tougher, surprise inspections of its nuclear program.

The United States is pushing for action against what it claims is a covert Iranian program to develop atomic weapons.

Iran's foreign minister said in Tehran on Saturday that the Islamic republic may soon agree to tougher inspections.

Kamal Kharazi said if what he called 'ambiguities' were removed, Iran could then sign the protocol.