Riots have broken out across northern Nigeria as presidential poll results show Goodluck Jonathan is set to win.
Homes of supporters of Mr Jonathan, the incumbent, were attacked in the cities of Kano and Kaduna.Young supporters of Muhammadu Buhari, who is popular in the north, have been clashing with police and military.
They feel that the elections have been rigged in some areas of the south where there is a discrepancy between turnout and results.
With nearly all the votes counted, Mr Jonathan - a Christian from the oil-producing Niger Delta - has almost twice the number of his main rival.
The African Union observer team said it was Nigeria's best poll for decades.
