DUBAI (Reuters) -Israel will receive a "devastating and decisive response" if it attacks Iran, Tehran's Revolutionary Guards said on Thursday, days after CNN reported U.S. intelligence suggesting Israel was making preparations to strike Iranian nuclear facilities.

Iran’s top diplomat warned Thursday that his country would take “special measures" to defend its nuclear facilities if Israel continues to threaten them, raising the stakes further ahead of a new round of talks with the United States.

Iran’s nuclear facilities are deep underground and heavily fortified. An effective attack by Israel would require U.S. assistance for both mid-air refueling and munitions, according to the February intelligence report.