The attack at noon targeted a town hall where Christian Igbo people were holding a meeting, with gunmen chanting "God is great" as they fired Kalashnikov rifles.
The killings come after a spokesman for the sect known as Boko Haram threatened to begin specifically targeting Christians living in the country's Muslim north in its increasingly bloody sectarian fight with Nigeria's weak central government. That could further inflame religious tensions in an uneasy nation already gripped by civil unrest.
The attack occurred in Mubi in Adamawa state as Igbo traders held a meeting before opening up their shops for business, local police commissioner Ade T. Shinaba said. "We started hearing many gunshots through the windows," said Okey Raymond, 48, who attended the meeting. "Everyone scampered for safety, but the gunmen chanted: 'God is great God is great' while shooting at us."
Raymond said he hid under a table and escaped out a back door. The gunmen also carried knives and machetes, the police commissioner said. No arrests have been made in the attack, which left at least another 15 people wounded. Today's attack comes after gunmen attacked a church in the northeast Nigeria city of Gombe during a prayer service Thursday night, spraying the congregation with gunfire and killing at least six people including the pastor's wife.
No one has claimed responsibility for that attack, though Boko Haram has targeted churches in the past in its campaign to implement strict Shariah law across Nigeria. Boko Haram, whose name means "Western education is sacrilege" in the local Hausa language, is responsible for at least 510 killings last year alone, according to an Associated Press count.
The group claimed responsibility for an attack that killed at least 42 people in a Christmas Day bombing of a Catholic church near Abuja, as well as a suicide car bombing targeting the U.N. headquarters in the capital that killed 25 people and wounded more than 100. Nigeria's weak central government has been slow to respond to the sect.
On Dec. 31, President Goodluck Jonathan declared regions of Borno, Niger, Plateau and Yobe states to be under a state of emergency -- meaning authorities can make arrests without proof and conduct searches without warrants. He also ordered international borders near Borno and Yobe state to be closed. However, the areas where the recent church and town hall attacks happened are not in the areas marked by the president.
The attack also comes after a spokesman for Boko Haram told The Daily Trust newspaper, northern Nigeria's paper of record, that the group would begin targeting Christians living in Nigeria's Muslim north. Igbo traders, who belong to one of the country's three dominant ethnic groups, do business and live across Nigeria's north though the Igbo traditionally have lived in the country's southeast.