Iran and Israel continued trading fire in a fourth day of armed escalations. "The residents of Tehran will pay the price, and soon," Israeli Defense Minister Israel Katz pledged following reported Iranian strikes against Tel Aviv and Haifa.

Oil prices surged, stocks dropped and investors flocked to safe havens like gold on Friday after tensions between Israel and Iran escalated, stoking concerns of a broader conflict in the region.

U.S. oil prices already jumped last week, which could cause prices at the pump to rise about 20 cents a gallon in the coming weeks, according to one estimate.