Nigeria: Explosion in Lagos port 9 January 2013 Last updated at 13:16 There has been a loud explosion at an oil depot in Lagos port, authorities in the Nigerian city have said. The blast, which shook buildings in the Apapa area, happened during a transfer of fuel, the National Emergency Management Agency (Nema) said. Nema's Akande Iyiola told the BBC the oil depot was owned the petroleum company MRS Oil. Firefighters are working to douse the flames and four people were wounded in the blast, AFP news agency reports. Many tankers dock at jetties in the port in Lagos to load and unload petroleum products. Nigeria is one of the world's biggest oil producers, but imports refined petrol.