Iran has done everything necessary to clear up outstanding concerns about its nuclear programme, which Washington says could be used to make atomic bombs, a top Foreign Ministry official said yesterday.

?Iran has answered all ambiguities on its nuclear activities and there is nothing left on the table?, Foreign Ministry spokesman Hamid Reza Asefi told a weekly news conference.

Asefi?s comments came a few days after Tehran challenged the United States to produce hard evidence Iran is trying to build a nuclear bomb. Washington said there is proof enough in a new International Atomic Energy Agency (IAEA) report.

The IAEA, in a report issued last week, said the origin of enriched uranium traces found in Iran?s sites and the issue of advanced P2 enrichment centrifuges must be resolved before the agency can verify Tehran?s atomic aims.

Iran insists its nuclear programme is geared solely to the peaceful generation of electricity. It says the traces of enriched uranium were caused by contamination from components bought from black market suppliers. Tehran also argues its work on P2 centrifuges ? which could be used to make bomb-grade fuel ? has not gone further than preliminary research.

Under intense international pressure following revelations Tehran had engaged in an 18-year cover-up of sensitive nuclear research, Iran last month submitted what it says is a full declaration of its past nuclear activities.

?On the contamination, we do not have anything new to say?, Asefi said. ?On the P2, ... after the second report that we handed in we have nothing more to say.?

The IAEA?s 35-member Board of Governors will meet on June 14 to discuss Iran?s nuclear case.