 Now outside Africa, United States military ship has fired one in shots after three vessels from Iran's Islamic Revolutionary Guard at a core came close to it and another American patrol boat in the Gulf. Such incidents have occurred occasionally over the past five years, though there's been a relative lull over the past year. While officials said it was too early to discern the exact motivation of the Iranian forces, they have said that generally in the past such incidents are carried out by local commanders rather than directed by senior Iranian leaders. The closest the Iranian fast-in-shore attack craft came to the American ship was 68 yards. The incident comes as world powers and Iran seek to speed up efforts to bring Washington and Tehran back into compliance with the 2015 nuclear accord. So you get notified about fresh news updates.