A suicide bomber killed at least 10 people in an attack on a mosque in northern Cameroon today, in the latest attack linked to an insurgency by militant group Boko Haram. The Islamist group whose origins are in northeastern Nigeria has stepped up attacks in neighbouring Cameroon, Chad and Niger since last year. Many of the recent Cameroon attacks have been conducted by women.<br/><br/>Boko Haram has waged a six-year campaign for an Islamist state in north eastern Nigeria. Neighbouring countries joined an offensive against the group this year and the conflict spilled across their borders, displacing tens of thousands of people.