Louis Theroux runs from gunfire in Lagos

Louis Theroux joins a political rally in Lagos, Nigeria where it is not the police who wield power on the streets but gangs of fight-hardened young men known as Area Boys.

As celebrations of a former Area Boy's election get underway, gunshots are fired, blood is seen and mayhem ensues.

Watch Louis Theroux's report on Lagos on BBC Two at 2100 BST on Sunday 10 October, or find out more at Louis Theroux - Law and Disorder in Lagos.