Nigeria has ordered prosecutors to arrest anyone using Twitter, after banning the social media platform nationwide. Nigeria’s Ministry of Information announced Friday — ironically, in a tweet — that it had suspended Twitter operations in Nigeria. The crackdown came after Twitter deleted a tweet by President Muhammadu Buhari that threatened secessionists in southeastern Nigeria with violence. Many saw Buhari’s tweet as a threat of genocide against members of the minority Igbo group, who make up about 20% of Nigeria’s population.