An explosion in a crowded Nigerian marketplace during rush hour on Wednesday killed at least 21 people and injured 17 according to authorities. It hasn’t been confirmed as a bombing yet. If it proves to be one, it will be the third bombing in the capital, Abuja, in just three months. Police say one suspect had been arrested and another had been killed. Just this Monday, Nigeria suffered a school bombing. With this most recent blast, Boko Haram has not been confirmed as the perpetrator, but the Islamic militants have increasingly targeted civilian areas.