Boko Haram militants dressed as soldiers have reportedly killed up to 200 villagers in three attacks in northern Nigeria.
The killings - in Danjara, Agapalwa and Antagara - are said to have taken place on Monday and a community leader who reportedly witnessed them said residents of the Gwoza local government district in Borno state had pleaded for protection from the army but no help had arrived.
The militants arrived in pickup trucks of the type often used by the military and told the civilians they were soldiers "and we are here to protect you all".
The schoolgirls were abducted on April 15. Once people had gathered in the heart of the villages, as ordered, Boko Haram members began "to shout 'Allahu Akbar, Allahu Akbar' on top of their voices, then they begin to fire at the people continuously for a very long time until all that gathered were all dead", said one frightened witness who did not wish to be named.
It took time for survivors to get word of the killings to the provincial capital, Maiduguri, because of poor road conditions and limited telecommunications.
Local politician Mohammed Ali Ndume confirmed the attacks had taken place.
Gwoza is a regional political centre, whose emir - a religious and traditional ruler - was killed in a Boko Haram ambush on his convoy last week.
President Goodluck Jonathan has been criticised for not visiting the region He had spoken out against the actions of the militants.
Boko Haram wants to establish an Islamic state in Nigeria and has been been fighting back against a year-long government-backed military offensive aimed at crushing them.
The group has taken over villages in the northeast, killing and terrorising civilians and political leaders.
It is currently holding hundreds of schoolgirls captive after snatching them from school in the remote village of Chibok in April.
More than 2,000 Nigerians are believed to have been killed so far this year with some 75,000 civilians driven from their homes.
While Boko Haram has largely been pushed out of cities in the northeast, the group has been seizing villages in remote areas, making large swathes of Nigeria, no-go areas for the army.
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