Suspected separatist militants from the Indigenous People of Biafra (IPOB) and its armed wing, the Eastern Security Network (ESN), killed four Nigerian police and two civilians in a gunfight in the Ngor-Okpala area of Imo State. IPOB has been blamed for numerous attacks on police, local government offices and electoral-agency buildings in the southeastern states where the group demands a separate state for Igbo people. The separatist movement has repeatedly denied that it is behind the attacks.