Greek coast guard ships opened fire on a cargo vessel sailing in international waters in the Aegean Sea, the Turkish coast guard said, escalating tensions between the regional rivals that have mounted in recent weeks. There were no casualties in the shooting 11 nautical miles (13 miles) southwest of the Turkish island of Bozcaada on Saturday, the Turkish statement said. It added that after “harassment fire” from two Greek coast guard vessels, two Turkish coast guard ships went to the area and the Greek boats left. Calls to the Greek Embassy in Ankara went unanswered Sunday, and it wasn't clear...