General Yoav Gallan, who accompanied Sharon to Monday's talks at Bush's Texas ranch, presented the photos as well as information gathered by the Israeli intelligence services on Tehran's nuclear programme.

The radio, which did not give details on how the photos were taken, said the images proved that the Iranian nuclear programme was at a "very advanced" stage.

White House spokesman Scott McClellan confirmed the two leaders had "talked about their shared concern about Iran's intentions with their nuclear programme" but denied they had discussed the possibility of a preemptive military strike by Israel, aimed at ensuring Iran does not acquire atomic weapons.

The United States and Israel have both accused Iran of using its atomic energy programme as cover for a plan to develop nuclear arms, a charge denied by Tehran which says it needs nuclear power as an alternative energy source.

Israel itself has never publicly acknowledged that it maintains a nuclear arsenal but foreign experts say it has between 100 and 200 nuclear warheads.