(Reuters) – Mauritius has arrested the captain of a Japanese bulk carrier that ran aground off its coast, causing a devastating oil spill in one of the world’s most pristine maritime environments, police said on Tuesday.

“We have arrested the captain of the vessel and another member of the crew. After having been heard by the court they have been denied bail and are still in detention,” Inspector Siva Coothen told Reuters.

The MV Wakashio struck a coral reef off the Indian Ocean island nation on July 25 and began spilling oil on Aug. 6, prompting the government to announced a state of “environmental emergency” the next day.

The oil spill spread over a vast area of endangered corals, fish and other marine life in what some scientists called the country’s worst ecological disaster. Emergency crews managed to remove most of the remaining oil before the carrier split in two on Saturday.

Scientists say the full impact of the spill is still unfolding, but the damage could affect Mauritius and its tourism-dependent economy for decades. Removing the ship is likely to take months.

(Reporting by Giulia Paravicini; Writing by Katharine Houreld; editing by John Stonestreet and Giles Elgood)