DEVELOPING STORY: Four Americans aboard a yacht hijacked by Somali pirates have been killed, Fox News has confirmed. U.S. forces responded to gunfire aboard the yacht Quest at approximately 1 a.m. Tuesday, but discovered all four hostages had been shot by their captors. Despite attempts to save their lives, all four hostages died of their wounds. We express our deepest condolences for the innocent lives callously lost aboard the Quest, said Gen. James N. Mattis, U.S. Central Command Commander in a news release. Two pirates died during the confrontation and 13 were captured and detained, along with two pirates already in custody. U.S. forces also found the remains of two other pirates already dead aboard the vessel and believe a total of 19 pirates were involved in the hijacking. FoxNews.com - Four Americans Killed on Yacht Hijacked by Somali Pirates Fox News. The Number One Source of News in America.