Voice of America | Amnesty: Shell Did Not Clean Oil Spills in Niger Delta Voice of America November 03, 2015 10:04 AM. ACCRA—. Amnesty International and the Center for Environment, Human Rights and Development in Nigeria say multinational oil company Shell has not cleaned up four oil spill sites in the Niger Delta, as the company claims. Shell 'failing to clean up Nigeria oil spills' Amnesty report accuses Shell of failing to clean up Niger delta oil spills Amnesty accuses Shell of failing to clear Nigeria oil spills |