Citing what it said were several Israeli military sources The Sunday Times quoted several Israeli military sources as saying that two of the Jewish state's air force squadrons are training to use "bunker-busting" bombs for a single strike.
But Israel has refuted the report. An Israeli official said:"This is absurd information coming from a newspaper that has already in the past distinguished itself with sensationalist headlines that in the end amounted to nothing," .
"To think that we will launch an atomic attack against Iran, and on top of that that we would reveal it in advance to a foreign newspaper is doubly ridiculous," he said.
The Sunday Times - which in 1986 first revealed Israel's undeclared nuclear arsenal - said the plans involved sending conventional, laser-guided missiles to open up "tunnels" in the targets before "mini-nukes" with a force the equivalent of one-fifteenth of the Hiroshima bomb are fired in.
"As soon as the green light is given, it will be one mission, one strike and the Iranian nuclear project will be demolished," one of the unnamed sources was quoted as saying.
Iran warned that it would hit back against any attack in a way that would leave its enemy regretting that it had made such a move.
"Any action against the Islamic republic will not go without a response and the aggressor would regret the action very quickly," Mohammad Ali Hosseini, foreign ministry spokesman, said.
He described the report as "proof of the weakness of the enemy and will have no effect on the determination of the Islamic republic to continue its (nuclear) activities."
Israel and the United States, the Islamic republic's two arch-enemies, accuse Iran of seeking a nuclear weapon -- a charge vehemently denied by Tehran, which refuses to bow to UN demands to halt uranium enrichment work.
Even after the UN Security Council agreed to impose its first-ever sanctions on Iran in December, Israel has pushed for tougher international action against the country.
Iran's hardline President Mahmoud Ahmadinejad has in the past sparked consternation by calling for the Jewish state to be wiped off the map and also casting doubt on the scale of the Holocaust.