Stock futures were falling in the U.S. Sunday evening as oil added about 4%. Investors and traders are braced for the opening of Monday trading in New York after the weekend attacks on Iran’s nuclear sites.

Oil prices extended Monday's slide, with Brent crude futures down more than 3%, and are now back around where they were when fighting kicked off earlier this month. The cease-fire spurred a global stock-market rally,

The price of oil jumped more than 2% and U.S. stock futures and Asian shares are down as global markets react to the American bombing of nuclear targets in Iran.