IAEA chief says Iran nuclear impasse can't be solved militarily

"Iran had a very vast, ambitious program, and part of it may still be there. And if not, there is also the self-evident truth that the knowledge is there," International Atomic Energy Agency chief Raphael Grossi told CBS in an interview.

"The industrial capacity is there. Iran is a very sophisticated country in terms of nuclear technology, as is obvious. So you cannot disinvent this, military operations or not. You are not going to solve this in a definitive way militarily."

Grossi said Iran had not yet asked IAEA inspectors to leave the country, in what he called a positive sign.

"The work will have to continue. Otherwise, nobody will have an idea of what is happening in Iran."