The ceasefire in the Iran war abruptly faced its most perilous moment Monday after the United States began trying to open the Strait of Hormuz to allow hundreds of stranded commercial ships sail out. The United Arab Emirates said it came under attack for the first time since the early April ceasefire, and a British military monitor said two cargo vessels were ablaze off the UAE. There had been warning signs around the U.S. military-aided effort to guide ships through the strait, as Iran called i