Widespread and systematic murder and persecution by Boko Haram, a militant Islamist group in northern Nigeria, likely amount to crimes against humanity. Human Rights Watch documents violence and atrocities, which Boko Haram has claimed responsibility, that has claimed more than 2,800 lives. Boko Haram’s attacks – centered in northern Nigeria – have primarily targeted police and anyone working for or accused of cooperating with the government. Government security forces have also engaged in numerous abuses, including extrajudicial killings, which contravene international human rights law and might also constitute crimes against humanity. Security forces have killed hundreds of Boko Haram suspects and other members of the public with no apparent links to the group, in the name of ending the group’s threat to the country’s citizens. But the authorities have rarely prosecuted those responsible for the Boko Haram violence or security force personnel for their abuses.