Top leaders' feud threatens oil-rich Nigeria's stability

As Nigeria's president and vice president hurl charges of corruption at each other in a vicious public quarrel, Nigerians and foreign investors can only wonder what it all means for the future of Africa's top oil producer.

Ask Nigerians in political circles where the face-off might lead and you get answers ranging from business as usual to a cataclysmic scenario involving widespread ethnic and religious violence followed by a military coup.