Major powers want Iran to come to nuclear talks ready to take steps to curb its enrichment of uranium to 20 per cent purity, a level that brings it closer to developing bomb grade material, US Secretary of State Hillary Clinton said on Thursday.

"We want them to come prepared to take concrete steps, particularly in the area of 20 per cent enrichment," Clinton told reporters, referring to a meeting on Iran's nuclear programme to be held on June 18 and 19 in Moscow. – Reuters