The Boko Haram fighters penetrated the camp in Banki on Nigeria’s border with Cameroon which houses 45,000 internally displaced people (IDP), using knives to kill their victims silently.
“At around 12:30 am (2330 GMT Thursday) this morning some Boko Haram terrorists broke the barricade securing the IDP camp from the rear towards the Cameroon border and entered to seize food from IDPs,” a senior military officer in the town said.
“They killed 11 IDPs and wounded two in the attack,” said the military officer who spoke on conditions of anonymity.
“We have reason to believe they most likely acted on a tip-off from insiders,” said the officer who suggested that wives or children of Boko Haram fighters may have infiltrated the camp disguised as displaced people to conduct reconnaissance.
Adamu Ahmad, a member of a civilian militia charged with protecting the Banki camp, confirmed the incident.
“The jihadists used knives to kill their victims instead of firearms to avoiding alerting soldiers at a military base adjacent to the camp,” Ahmad said.
Soldiers expelled the attackers from the camp after the informal militia raised the alarm. The raiders also stole food aid rations given to those living in the camp, said the military officer.
Banki, which is 130 kilometres (80 miles) southeast of Borno state capital Maiduguri, was initially an area of relative safety for those fleeing Boko Haram since the camp opened in March 2015. But it has been repeatedly targeted by Boko Haram suicide attacks.
In April last year, at least seven people were killed at the camp in a suicide bomb attack carried out by two women.
In January, a ten-year-old girl died in a botched suicide attack after the explosive vest she was wearing detonated outside the camp.
Boko Haram is waging an insurgency in a bid to establish a hardline Islamist state in Nigeria’s mainly Muslim north.
At least 20,000 people have been killed in violence since 2009 and more than 2.6 million people have been left homeless.
More than five million people are starving as the fighting has devastated farmland, leaving farmers unable to sow or cultivate crops for several years.
The insurgent group is reported to be running desperately low on supplies after Nigerian security forces successfully cut off supply lines to the group’s bases.