United States airstrikes against Iran have expanded over two weeks of conflict. Initial strikes targeted Iran's navy and coastal defenses in the Strait of Hormuz. Recent attacks now hit bridges and infrastructure deeper inside Iran. Iran has retaliated with intensified strikes on ships and Gulf countries. The conflict has pushed both nations back toward potential all-out war.

The latest US strikes on tunnels, bridges, and other infrastructure further inland from the Strait of Hormuz could indicate that Washington is shifting gears in Iran.

The United States has gradually expanded the scope of its attacks against Iran over the course of two weeks of punishing airstrikes that increasingly resemble the war’s opening…