The United Arab Emirates said Thursday that special forces from a hostile nation likely carried out coordinated attacks last month on four ships near the Strait of Hormuz, but stopped short of directly accusing Iran. In a closed-door briefing to members of the United Nations Security Council, Emirati officials presented their preliminary conclusions that small boats dropped divers in the waters near a busy U.A.E. port and that the divers then placed limpet mines on the hulls of the four ships. …