U.S. calls on N.Korea to come clean on uranium

North Korea still has not responded to U.S. suspicions of proliferating nuclear technology and enriching uranium for weapons, U.S. Secretary of State Condoleezza Rice said on Saturday.

On Thursday, secretive North Korea delivered a long-delayed list of its nuclear activities, as it was required to do in a six-way disarmament-for-aid deal. The inventory mostly outlined Pyongyang's programme to produce arms-grade plutonium.

"Thus far we don't have the answers we need on either," Rice said in a joint news conference with South Korean Foreign Minister Yu Myung-hwan.

She said that she expected the North to live up to its obligations under the deal, and "at the end of this we have to have the abandonment of all programmes, weapons and materials".