尼日利亚某大学遭自杀式炸弹袭击At least six people have been killed in a suicide bombing at a college in northern Nigeria's biggest city, Kano, witnesses say.位于尼日利亚北方最大城市卡诺的一所大学发生一起自杀式炸弹袭击，至少六人遇害。The bomber was hidden among st udents at the college, witnesses say The female bomber is reported to have blown herself up as students queued to check their names on an admission list. Meanwhile the government says a 10-year-old girl with a suicide belt has been arrested in a neighbouring state. Militant Islamist group Boko Haram has been waging an insurgency in Nigeria since 2009. The college bombing was the fifth attack in Kano since Sunday. 'Huge crowd' At least three of the attacks were carried out by female bombers, in what BBC Nigeria analyst Aliyu Tanko describes as a new trend in the insurgency. It is unclear whether the group is recruiting female bombers or forcing kidnapped girls to carry out suicide missions, he says. Boko Haram is holding more than 200 girls that its gunmen abducted during a raid in April on a boarding school in Chibok town in the northern state of Borno.
