Wearing long hijabs, the anonymous women squeeze quietly into crowds, barely noticed.
One slipped in among students gathered Wednesday at a notice board of a college campus in the northern Nigerian city of Kano. She detonated a hidden bomb, killing herself and at least five others, wire services reported.
On Sunday, a 15-year-old female suicide bomber blew herself up near a temporary university site, with no other casualties. Another pushed into a queue of women buying kerosene at a fuel station Monday, detonating a bomb that killed herself and at least three others. Hours later, an 18-year-old woman approached a shopping mall and detonated a bomb. She killed only herself.
No group has claimed responsibility for the rash of daily attacks in Kano, but experts say they bear the marks of the Islamist extremists led by Boko Haram. Police in adjacent Kastina state arrested a 10-year-old girl wearing a suicide vest Tuesday, government spokesman Mike Omeri said Wednesday. Two other Boko Haram suspects were arrested, he said.