Most of those who came to the territory, a Spanish exclave in Africa, have returned across the border to Morocco. At least 67 people died trying to enter, the authorities said.

Jeanine Pirro, the U.S. attorney in Washington, blamed shoddy construction, contradicting President Trump’s pet theory. Mr. Trump said he disagreed “100%” with her.

During a fleeting truce, Iranians covertly devised a plan to raise the war’s costs for President Trump if U.S. forces attacked anew.