As results showed President Goodluck Jonathan defeating Muhammadu Buhari, protests began in several northern cities on 17 April 2011 and quickly turned violent. Human Rights Watch reported that more than 800 people were killed in three days, many in reprisal killings in southern Kaduna State, and that around 65,000 people were displaced.
The Sheikh Lemu panel set up by the federal government investigated the causes and recommended prosecutions, though few followed.