Updated

The main militant group in Nigeria's oil-rich southern delta says it did not set a bomb that exploded inside a busy beer garden at an army barracks in the capital.

The Movement for the Emancipation of the Niger Delta sent journalists a statement Sunday denying responsibility for the bomb that killed at least four people and wounded 21 others.

Meanwhile, police say a radical Muslim sect set a church ablaze Saturday night in the northeastern city of Maiduguri. No one was hurt in the blaze set by the group known locally as Boko Haram.

Boko Haram claimed a series of Christmas Eve bombings that killed dozens in central Nigeria. Nigeria's president said Saturday the explosives used at the barracks appeared similar to those used in that attack.