BY NJADVARA MUSA

AND JON GAMBRELL

The Associated Press

MAIDUGURI, Nigeria -- A radical Muslim sect attacked a church worship service in Nigeria's northeast during assaults that killed at least 15 people, authorities said Saturday, as Christians vowed to defend themselves from the group's widening sectarian fight against the country's government.

The attacks by the sect known as Boko Haram came after it promised to kill Christians living in Nigeria's largely Muslim north, exploiting long-standing religious and ethnic tensions in the nation of more than 160 million people. The pledge by the leader of an umbrella organization called the Christian Association of Nigeria now raises the possibility of retaliatory violence.

In the past few days alone, Boko Haram has killed at least 44 people, despite the oil-rich nation's president declaring a state of emergency in regions hit by the sect.

Speaking Saturday to journalists, Pastor Ayo Oritsejafor, president of the Christian Association of Nigeria, vowed the group's members would adequately protect themselves from the sect. He declined to offer specifics, raising concerns about retaliation.

"We have decided to work out means to defend ourselves against these senseless killings," Oritsejafor said.

In Yola, the capital of Adamawa state, gunmen covered their faces with black cloth when they attacked Apostolic Church on Friday night, local police commissioner Ade Shinaba said. Shinaba said at least eight worshippers died in that attack.

At a nearby beauty salon, at least three others were killed in a similar attack.

Responding to the violence, Adamawa state Gov. Murtala Nyako ordered a 24-hour curfew throughout the rural state. The violence comes ahead of a planned gubernatorial election later this month.

No arrests have been made in any of the attacks, authorities said.

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