Two weeks ago, the US general stressed that an Israeli strike against Iran's nuclear facilities could only delay its nuclear program. On Thursday, he adopted even tougher rhetoric, telling Britain's The Guardian that an attack would "clearly delay but probably not destroy Iran's nuclear program".
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Dempsey said he did not know Iran's nuclear intentions, but noted that what was clear was that the "international coalition" applying pressure on Iran "could be undone if (Iran) was attacked prematurely".
Sanctions against Iran were having an effect, and they should be given a reasonable opportunity to succeed, he said.