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.

Iran calls US peace proposals 'unrealistic', Trump issues new warning to Tehran
Israel passes death penalty law for Palestinians convicted of lethal attacks
France seeks emergency UN meeting after Lebanon peacekeeper attacks
At least 70 killed in Haiti massacre, rights group says
Spain closes airspace to US planes involved in Iran war, defence minister says
