Iran is building a nonworking mock-up of an American nuclear-powered aircraft carrier that United States officials say may be intended to be blown up for propaganda value.

Intelligence analysts studying satellite photos of Iranian military installations first noticed the vessel rising from the Gachin shipyard, near Bandar Abbas on the Persian Gulf, last summer. The ship has the same distinctive shape and style of the Navy’s Nimitz-class carriers, as well as the Nimitz’s number 68 neatly painted in white near the bow. Mock aircraft can be seen on the flight deck.