ABUJA - Five bombs exploded on Christmas Day at churches in Nigeria, one killing at least 27 people, raising fears that Islamist militant group Boko Haram - which claimed responsibility - is trying to ignite sectarian civil war.

Boko Haram, which wants to impose Islamic sharia law across a country of 160 million split roughly between Christians and Muslims, has increased the sophistication of the explosives it uses this year and has increased the number of its attacks.

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St Theresa's Catholic Church in Madala, an Abuja satellite town about 40 km from the center of the capital, was packed when the bomb exploded just outside.

"We were in the church with my family when we heard the explosion. I just ran out," Timothy Onyekwere told Reuters. "Now I don't even know where my children or my wife are. I don't know how many were killed but there were many dead."

Boko Haram - which in the Hausa language spoken in northern Nigeria means "Western education is sinful" - is loosely modeled on the Taliban movement in Afghanistan.

The group's low level insurgency used to be largely confined to northeastern Nigeria, but it has struck several parts of the north, center and the capital Abuja this year.

The sect was blamed for dozens of bombings and shootings in the north, and has claimed responsibility for two bombings in Abuja this year, including Nigeria's first suicide bombing on the UN headquarters in August that killed at least 23 people.

Rights groups say more than 250 people have been killed by Boko Haram since July 2010.

Hours after the first bomb, blasts were reported at the Mountain of Fire and Miracles Church in the central, ethnically and religiously mixed town of Jos, and at a church in northern Yobe state at the town of Gadaka. Residents said many were wounded in Gadaka, but there were no further details.

A Reuters reporter on the scene of the explosion close to Abuja saw the church's front roof had been destroyed in the blast, as had several houses near it. Five burnt out cars were still smoldering.

"The officials who counted told me they have picked 27 bodies so far," Father Christopher Barde, Assistant Catholic Priest of the church, said.

There were scenes of chaos after the incident.

"Mass just ended and people were rushing out of the church and suddenly I heard a loud sound 'gbam'. Cars were in flames and bodies littered everywhere," Nnana Nwachukwu told Reuters.

"The blast occurred on the road by the church and not inside the church. I happen to also live close by the church. Help was very slow in coming to the injured."

The later blast in Jos, a tinderbox of ethnic and sectarian tensions that sometimes sees deadly clashes between Muslims and Christians, was accompanied by a shooting spree by militants, who exchanged fire with local police, said Charles Ezeocha, special taskforce spokesman for Jos.

"We lost one policeman and we have made four arrests. I think we can use them to get more information and work on that," he said.

Police found four other explosive devices in Jos, which they deactivated, he said.

Last Christmas Eve, a series of bomb blasts around Jos killed 32 people, and others people died in attacks on two churches in the northeast of Africa's most populous nation.

Residents of the northeastern city of Damaturu also reported two blasts. A local security source, who could not be named, said the militants tried to hit the State Security Service local office but their bombs went off before they could reach it.

President Goodluck Jonathan, a Christian from the south who is struggling to contain the threat of Islamist militancy, called the incident "unfortunate" but said Boko Haram would "not be (around) for ever. It will end one day."

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