Gunmen believed to be Islamic extremists have killed at least 162 people in western Nigeria. Local officials say the attack happened Tuesday in Muslim-majority villages in Kwara state and that the victims may have been targeted for refusing extremist ideology. The attackers razed homes and looted shops. Nigeria is facing a protracted fight with local armed groups, including Boko Haram and Islamic State affiliates. Kwara is emerging as a new frontier for these groups. The United States is supporting Nigeria with intelligence and military equipment. Despite some tensions, the two countries are cooperating to address the security crisis.