"We've talked about this issue in the past in public, and our view is that North Korea would need to give up all of its nuclear programs. That would include plutonium, as well as highly enriched uranium. That still stands," State Department spokesman Sean McCormack told reporters.

He was responding to reports suggesting that the North Koreans had denied they have any uranium enrichment capability during the fourth round of six-party nuclear negotiations launched in Beijing on Tuesday.

The issue of highly enriched uranium, which can be used to produce nuclear explosive devices, was mentioned in a keynote speech by the United States at the talks.

North Korea denied having the secret uranium enrichment program, either for weapons or for peaceful purposes, in a bilateral meeting with the United States on Tuesday, some unconfirmed reports say.

North Korea has claimed it already possesses nuclear weapons but has never admitted having a uranium-enrichment program.

North Korea abandoned the six-party talks last year, complaining of hostile US policy, but returned to the negotiating table after a 13-month hiatus -- enticed in part by a softer US approach.

The stand-off was sparked in October 2002 when Washington said North Korea had admitted operating a nuclear-weapons program based on enriched uranium, in violation of a 1994 agreement to halt the North's weapons program based on plutonium production.

All rights reserved. © 2005 Agence France-Presse. Sections of the information displayed on this page (dispatches, photographs, logos) are protected by intellectual property rights owned by Agence France-Presse. As a consequence, you may not copy, reproduce, modify, transmit, publish, display or in any way commercially exploit any of the content of this section without the prior written consent of Agence France-Presse.