The Singapore-flagged cargo vessel Potentia with 19 crew members and the Vanuatu-flagged ship ANT with 13 crew collided in the eastern Aegean Sea nine miles north of Chios.

"There are no injuries, there is no risk of pollution," a coast guard official told Reuters on condition of anonymity, adding that the ships were not loaded with cargo.

It was not immediately clear what had caused the collision, the official added. Greek authorities have deployed seven vessels and a search and rescue helicopter to the site.

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