Iran vowed to defend itself after the United States military joined Israel’s war against Iran early Sunday morning by dropping bombs and firing missiles at three key nuclear sites in the country, prompting fears that the American attack could lead to more dangerous escalations across the Middle East.

Trump said the U.S. hit the Fordow, Natanz and Isfahan nuclear sites. Iran’s top diplomat called the attack “outrageous” and said it would have “everlasting consequences.”

Several close U.S. allies have urged a return to the negotiating table in the wake of American strikes on Iran while noting the threat posed by Iran's nuclear program