The Turkish Coast Guard Command said that two Greek Coast Guard boats "opened fire" on Sept. 10 at a ro-ro ship 18 kilometers (11 miles) off Turkey's southwestern coast of Bozcaada.
The Comoros-flagged "Anatolian" ship with a crew of 18 -- six Egyptians, four Somalis, five Azerbaijanis and three Turkish nationals -- was "attacked" while sailing in international waters, the Turkish Coast Guard Command said in a statement, Anadolu News Agency reported.
After learning about the incident, the coast guard dispatched two boats and the Greek boats left the area.
No one was injured on the ship, it added.
The ship is being escorted by two boats and an investigation has been initiated regarding the incident, it said.
Turkey asked Greek authorities for an immediate investigation and explanation about the incident, according to diplomatic sources.