Ten gunmen on motorbikes stormed the northeastern Cameroonian border village of Hambagda near Gwoza, once the capital of Boko Haram's self-announced "caliphate", on Thursday before kidnapping six people and killing four others.
"They asked people to assemble but everyone started running towards the bush," a local resident Usman Buba told AFP yesterday.
"They seized six people in the confusion and slaughtered four while two managed to escape."
The attack came a day after soldiers arrested Boko Haram commander Adamu Rugurugu during a village raid.
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"The attack was evidently in reprisal for the arrest of a Boko Haram kingpin who has been terrorising the village," Buba said.
Another resident, Dahiru Alkali, confirmed his account, adding that villagers had complained to soldiers of incessant attacks by Rugurugu and his men.
The two witnesses were able to reach AFP by telephone after arriving in Maiduguri, capital of Borno state.
Boko Haram seized Gwoza in July 2014 and made it their headquarters at a time when they were seizing swathes of northeast Nigeria in their bid to form a hardline Islamist state.
In April, Boko Haram kidnapped 13 women who were picking fruit near Hambagda, while a month earlier its fighters abducted 18 girls from the nearby village of Pulka.
Large areas around Lake Chad and the Cameroon border remain inaccessible in an ongoing insurgency that has killed at least 20,000 since 2009.
Eleven people were killed on Wednesday when Boko Haram gunmen and suicide bombers launched a rare combined attack inside Maiduguri.
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