The U.S. and Iran each fired barrages of missiles Thursday, as the pattern of back-and-forth strikes took hold again and hope dimmed for any quick resolution.

The flare-up on multiple fronts, after several days of relative calm, raised the risk of a return to all-out war. It also underscored the difficulty of winding down a five-month…

The United States and Iran each fired barrages of missiles Thursday, as the pattern of back-and-forth strikes took hold again and hope dimmed for any quick resolution.