Gunmen in the northern Nigeria shot and killed at least six Christians late on Christmas Eve.
Military officials said a church in Peri village near Potiskum, the economic capital of the state Yobe, was set on fire.
Gunmen also attacked the homes of Christians following the attack during the midnight mass service.
AFP reported that the pastor of the church is among the dead. The head of the Christian Association of Nigeria said many worshippers were still missing.
The Boko Haram group has targeted a number of churches in the north since 2010 in a campaign to impose Sharia law.
A series of bombings by the group across the country at Christmas 2011 - including two at Christmas Day church services - left almost 40 people dead and many more wounded.