No, hasn't happened. Especially since Iran is not making nuclear weapons. It would look pretty bad for Israel to attack another country on the threat of nuclear weapons.....wait, that's already happened. Israel is too smart to make that mistake.
Apparently. Israel does not want to wait for the US election this fall. They are afraid I guess of a new administration, new foreign policies, etc. The US is their biggest Alli.
Another example of dirty deeds done dirt cheap by Israel on behalf of the United States. There was certainly an attack, though it's not yet clear if Israel was successful in hitting anything other than a few caves and bushes.