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"The investigative judge issued a detention decision against the ship's crew," said Mohamed Karay, a spokesman for the Gabes court.

The vessel carried between 750 tonnes and one thousand tonnes of fuel and sent a distress call seven miles away from Gabes to which the Tunisian navy responded, officials said.

The coast of the southern city of Gabes has suffered major pollution for years, with environmental organisations saying industrial plants in the area have been dumping waste directly into the sea.

The coast of Gabes has suffered major pollution for years, with environmental organisations saying industrial plants in the area have been dumping waste directly into the sea.

The ship carried one thousand tons of fuel and sent a distress call seven miles away from Gabes to which the Tunisian navy responded, the sources added.