An American Navy ship fired on a boat in the Persian Gulf today, killing one person and injuring three others aboard the craft, U.S. naval officials told ABC News. Lt. Greg Raelson, a spokesperson for the Navy's 5th Fleet, which is based in nearby Bahrain, said that a security team aboard the oil supply ship U.S.N.S. Rappahannock fired a .50 caliber machine gun at a "small motor vessel after it disregarded warnings and rapidly approached the U.S. ship" off the coast of Jebel Ali, a city approximately 30 miles from Dubai in the United Arab Emirates.