One analyst predicts gas prices at the pump could start falling within 48 hours following news of a two-week ceasefire between the U.S. and Iran.

Earlier, U.S. stocks swung sharply during regular trading as uncertainty about the war with Iran increased after Trump had threatened that a “whole civilization will die tonight."

President Donald Trump had threatened to destroy Iran's entire civilization if his 8 p.m. ET deadline to reopen the Strait of Hormuz is not met.