ATHENS, Oct 17 (Reuters) - A cargo ship sank after colliding with another vessel near the northern Greek port of Thessaloniki on Wednesday and a crew member was missing, the merchant marine ministry said.

"The Panama-flagged motorship Dubai Guardian collided with the Diamond 1 motorship at 1150 (0850GMT) and the latter sank," a ministry official, speaking on condition of anonymity, told Reuters.

"One of the crew members is still missing, probably the captain, while all others have been picked up."

She said the Diamond 1 was most likely a Greek-registered vessel. It was not yet clear why the ships collided.

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