International records / US diplomatic cables (WikiLeaks)
THE OFFER THAT WASN'T: NIGERIAN HELICOPTERS FOR DARFUR
CONFIDENTIAL//NOFORN cable from Abuja, Nigeria to African Union | Central Intelligence Agency | Defense Intelligence Agency | Department of Energy | Economic Community of West African States (ECOWAS) | Joint Analysis Center Molesworth | National Security Council | Lagos, Nigeria | Secretary of State | Khartoum, Sudan | United Nations (New York) | United States European Command