Nigeria's state-owned oil company says an oil tanker capable of carrying 800,000 litres of smuggled crude has been intercepted offshore while heading to Cameroon.\nNigeria's state-owned oil firm said the oil had been stolen from a well in the south-western state of Ondo.\nAs dramatic as this finding was, it is just a fraction of the oil being stolen in Nigeria. \nSo, what is behind it?