A reported confidential Iranian technical document describing Tehran''s efforts to design an atomic bomb trigger was forged by Washington, Iran''s President Mahmoud Ahmadinejad told a U.S. news program on Monday.

Ahmadinejad was asked by ABC News about a Times of London report last week on what it called a confidential Iranian technical document describing a four-year plan to test a neutron initiator, the part of a nuclear warhead that sets off an explosion.

"They are all fabricated bunch of papers continuously being forged and disseminated by the American government," he told the U.S. network in an interview in Copenhagen, Denmark, after he attended the United Nations conference on climate change.

Reports that Iran is working on a bomb trigger are "fundamentally not true," said Ahmadinejad.

The Times of London published on December 14 what it said was the Farsi-language document, along with an English translation, entitled, "Outlook for Special Neutron-Related Activities Over the Next Four Years".