Brazilian police are investigating an oil spill in an offshore field operated by the US company Chevron.<br /><br />Ships are working to disperse the slick 120km off the coast of Rio de Janeiro state.<br /><br />The oil is leaking from a well in the Frade oil project, 370km off the Brazilian coast. Chevron says they have plugged the oil well, but the Brazilian government and police disagree.<br /><br />Edison Lobao, Brazil's energy minister, has said the company will be "severely punished" if it is found to have failed in its environmental responsibilities.<br /><br />In recent years Brazil has discovered huge oil reserves in the Atlantic.<br /><br />Al Jazeera's Gabriel Elizondo reports from Rio de Janeiro.
