Tokyo: An oil spill from a wrecked Japanese ship has polluted seawater.
At least 40 dolphins have been reported dead near the East African island of Mauritius.
Environmental activists have called for an investigation into a Japanese ship that has been leaking oil at sea since July. At the same time, the ship was removed on Monday.
The Japanese ship MV Wakashio, which was carrying about 4,000 tons of fuel, collided with a coral reef on July 25 in Mauritius.
Hundreds of people are protesting in the capital of Mauritius over the discovery of dolphins in a dangerous condition.