Two suicide bombers have killed seven people on Sunday in twin attacks in northern Cameroon, near the border with Nigeria. The attacks in the far northern town of Kolofata brought to nine the number of suicide bombings in the area since July. On September 3, the nearby town of Kerawa was hit by two suicide attacks that killed at least 20 people. Cameroon is part of a five-nation force set up to fight Boko Haram alongside Nigeria, Chad, Niger and Benin. Cameroon's far north region bordering Nigeria and Chad for the past two years has been targeted by a rising number of Boko Haram raids, kidnappings and, more recently, suicide attacks.