ABUJA (Reuters) - Nigeria's President Muhammadu Buhari has ordered ministries to use only approved government bank accounts to make payments, the vice president's office said on Sunday, part of a drive to improve transparency and clamp down on corruption. Buhari, who took office in May after being elected on promises to fight endemic graft in Africa's biggest economy, has said he believes officials have stolen around $150 billion from the public purse over the past decade. Under the new system, all receipts due to the... More