As Israel and the US assess the impact of their strikes on Iran, the question remains unanswered as to whether Tehran's nuclear program has been destroyed or simply hidden in smaller, secret locations that are harder to detect, reports the Financial Times (FT).

The answer largely depends on the fate of the 408 kg of uranium enriched to 60percent—a level close to that needed to make a nuclear weapon.

US Secretary of State Marco Rubio had admitted that nobody will know for a few days whether Iran has attempted to move highly enriched uranium. But he added that he doubts they have moved it, as it’s almost impossible to move anything these days. As soon as the truck starts moving, the Israelis see it, target it, and destroy it, Rubio had told CBS.

But an FT source inside the Iran said that it would be very naive to keep enriched uranium in these places—referring to Fordow, Isfahan, and Natanz—and added that the uranium was not damaged.

Sima Shine, a former Iran specialist of the Israeli intelligence agency Mossad, is sure that Iran has moved the enriched material. They have enough enriched uranium somewhere, and they have moved some advanced centrifuges so that one day they can build a nuclear device. The Iranian nuclear weapon program is not completely destroyed, regardless of what the US says, Shine noted. 

And an Israeli official told the FT that Iran has likely secretly moved at least some of its stockpile. However, he added that after Israel killed at least 11 Iranian nuclear scientists last week, Iran will have difficulty building effective, miniature nuclear weapons.