Answers are beginning to emerge about what caused a mysterious oil spill that has stained Brazil's coastline for the last month.
Officials in the country say a Greek-flagged tanker is likely to be behind it.
Police in Rio de Janeiro raided the headquarters of a company that was linked to the marine vessel.
The spill has affected marine life in more than 2,500 km of the country's beaches and coastlines.

US military says it's completed 13th consecutive night of strikes on Iran
Indian government seeks time on minister resignation demand
Israel launches military operation after deadly clash near Palestinian village
Irish police intercept car with 'significant' bomb near Northern Ireland border
Spain declares national emergency over wildfires near Madrid and in Avila
