AlHijjah 16, 1432, Nov 12, 2011, SPA -- Brazil's President has ordered a full investigation into an oil spill near an offshore field operated by oil giant Chevron Corp. Dilma Rousseff says in a statement that she wants a "rigorous investigation" to determine responsibility for the spill near the well being drilled by Chevron's Brazilian subsidiary. The statement says the Mines and Energy Ministry and the National Petroleum Agency will conduct the probe. It's unclear how big the spill is, but the G1 news website says close to 2,640 gallons (10,000 liters) leaked from the well being drilled at the Frade field some 230 miles (370 kilometers) off the northeast coast of Rio de Janeiro state. The oil spill was detected on Thursday, AP reported.