Nigerian police say multiple bomb attacks by a radical Muslim sect killed eleven people in the country's northeast Tuesday.

Police say members of the group Boko Haram set off bombs at two police stations and a church in the town of Maiduguri.

Earlier Tuesday, police blamed the Boko Haram for the shooting death of a rival cleric in the town of Biu, north of Maiduguri.

Authorities said gunmen riding motorcycles killed Sheik Ibrahim Birkuti outside his home.

Birkuti had been critical of Boko Haram's use of violence, which has largely taken place in Borno state.

The group is fighting to establish Islamic law across Nigeria. Its name means “western education is sinful.”