An explosion rocked a packed mosque in Borno state, Nigeria, during evening prayers. Eyewitnesses said a suspected suicide bomber caused the blast. One report claims seven people died, but officials have not confirmed any casualties. Unverified social media footage shows dust and shocked people near a market after the blast. No one has claimed responsibility so far. The explosion happened in Maiduguri, the state capital. Boko Haram and its offshoot, Islamic State West Africa Province, have frequently attacked mosques and crowded places here. Boko Haram started its violent campaign to form an Islamic caliphate in Borno in 2009. Despite military efforts, attacks on civilians continue in northeast Nigeria.