A bomber killed at least 15 people in an attack on a religious ceremony , a Shiite cleric says . After the blast , soldiers shot and killed six people who had taken refuge , the cleric says . No one claimed responsibility , but Boko regime has launched attacks in the area before . The Nigerian military has not responded to a CNN request for comment on the shooting claim .
A bomber killed at least 15 people in an attack on a religious ceremony , a Shiite cleric says . After the blast , soldiers shot and killed six people who 'd sought refuge , the cleric says . No one claimed responsibility , but Boko Haram has made attacks in the area before . The Nigerian military has not responded to a CNN request for comment on the shooting claim .