COLOMBO — Hundreds of dead sea creatures, including whales and dolphins, have washed ashore in Sri Lanka, apparently poisoned by chemicals from a cargo ship that caught fire and sank, government officials said Wednesday (June 30), revealing some of the toll of what is being called the country’s worst environmental disaster.

The remains of four whales, 20 dolphins and 176 turtles have been found since the ship carrying the toxic material, the MV X-Press Pearl, caught fire in late May and sank in early June, Deputy Solicitor General Madhawa Tennakoon told a court in Colombo, Sri Lanka’s capital.

“It is very obvious that the deaths of these sea animals are connected to the ship,” said Ms Dharshani Lahandapura, the chairperson of Sri Lanka’s Marine Environment Protection Authority. “Last year, during the same time period only two turtle deaths were reported.”

The damage could actually be far worse, according to an official at the country’s Wildlife Conservation Department, who spoke on the condition of anonymity because the person was not authorized to speak to the media. In addition to the dead animals reported to the court, the official said, the carcasses of a shark and two more turtles were found Wednesday.

The MV X-Press Pearl, carrying 1,486 containers, reported a fire onboard May 20 as it approached the Colombo harbour. Sri Lanka’s navy and air force, together with the Indian coast guard, tried to douse the fire.

The ship’s operator, X-Press Feeders, based in Singapore, has said that one of those containers had been leaking nitric acid well before the ship entered Sri Lankan waters. The company said the ship had asked to offload the leaking container at two previous stops, in India and Qatar, but had been denied.

The ship began sinking in shallow water near Colombo on June 2, coming to rest on the bottom with part of its structure protruding above water, as experts voiced concerns about the lasting damage the chemicals could do to marine life.

The containers held chemicals such as caustic soda, nitric acid, methanol and plastic pellets, and the ship also carried about 350 US tons (317.5 tonnes) of oil. The Colombo-based Center for Environmental Justice has estimated that the ship spilled as many as 70 billion tiny bits of plastic known as nurdles, which can fatally clog the digestive systems of animals that eat them.

Following the fire, Sri Lanka’s pristine beaches, mostly in Western province, were covered by debris and plastic pellets. The ship’s operator, however, has said it has not seen any signs of an oil spill.

“To date we have collected over 1,500 tons of debris that consisted mostly of plastic pellets,” said Captain Indika De Silva, a spokesman for Sri Lanka’s navy.

The government has banned fishing on part of the coast.

An expert panel in Sri Lanka was finishing a damage assessment report. Sri Lanka’s state minister for fisheries Kanchana Wijesekera said that the ship’s operator was making a payment of US$3.6 million (S$4.85 million) to affected fishermen as part of the initial damage claim of US$40 million made by the government for losses through June 3.

“Discussions are underway to provide an initial payment of funds to help compensate those affected by the consequences of the fire and resulting pollution and help cover cleanup costs,” X-Press Feeders said in a statement.

This article originally appeared in The New York Times.