FILE - In this Monday June, 22, 2015 file photo, People gather at the site of a suicide bomb attack at a market in Maiduguri, Nigeria, A teenage girl strapped with explosives ran away from a crowded mosque this week, killing only herself and cementing suspicions that Boko Haram is using unwilling captives in its terror campaign in northeast Nigeria. The girl took off after her companion blew up in an explosion that killed 30 people on Monday in Maiduguri, the biggest city in northeast Nigeria, w