Iran does not yet have any highly enriched uranium, the fuel needed to make a nuclear warhead, two top U.S. intelligence officials told Congress Tuesday, disputing a claim by an Israeli official.

U.S. National Intelligence Director Dennis Blair and Defense Intelligence Agency Director Lt. Gen. Michael Maples said Tuesday that Iran has only low-enriched uranium — which would need to be refined into highly enriched uranium before it can fuel a warhead. Neither officials said there were indications that refining has occurred.

Their comments disputed a claim made last weekend by Israel''s top intelligence military official, who said Iran has crossed a technical threshold and is now capable of producing atomic weapons.

The claim made by Israeli Maj. Gen. Amos Yadlin runs counter to estimates by U.S. intelligence that the earliest Iran could produce a weapon is 2010, with some analysts saying it is more likely that it is 2015.

Maples said the United States and Israel are interpreting the same facts, but arriving at different conclusions.

"The Israelis are far more concerned about it," Maples told the Senate Armed Services Committee.

The status of Iran''s nuclear program has been the subject of conflicting public statements by top military and intelligence officials recently in the wake of U.N. revelations that Iran has more low-enriched uranium than previously thought.