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.

Israeli strikes kill two in Gaza, destroy medicine storage warehouses
Restaurant explosion in central Moscow kills three, injures 15
Thirteen die in tourist plane crash over Peru's Nazca Lines
All 10 climbers confirmed killed in Pakistan avalanche
