Thousands of dead fish have been found floating in the sailing venue for next year's Olympic Games in Rio de Janeiro.
The carcasses of twaite shad - small silver fish belonging to the herring family - have filled huge swathes of water in Guanabara Bay, and were even found washing up on the coastline outside Rio's international airport.
They were discovered by inspectors testing pollution in the bay, which has consistently high levels of garbage and untreated sewage in the water.
The city's environmental agency says it has launched an investigation, with results expected in a week's time. Officials say it is likely the fish fell victim to the intense drought.
The promise to clean up the notoriously filthy Guanabara Bay was part of Rio's Olympic bid.
This week, the International Olympic Committee said the city was making "solid progress" in its preparations for the 2016 Games, following a visit on Monday.
But last month, the Government admitted it would miss its target of reducing water pollution by 80% by the start of the Olympics next August.
State governor Luiz Fernando Pezao admitted that cleaning up the area has not been easy. "Every time we have a negotiation, the bidding process [for the project] slows and postpones things," he said.
For years, sewage has flowed into the bay from the surrounding urban sprawl. Fifteen cities share its shoreline. That means more than eight million residents, producing over 18,000 litres of sewage per second.
Mass fish deaths are common in waterways across Rio. The local O Globo newspaper reported this week that 60 tonnes of dead fish were collected in November alone.
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