A screengrab taken on November 9, 2014 from a new Boko Haram video released by the Nigerian Islamist extremist group Boko Haram and obtained by AFP shows Boko Haram fighters parading on a tank in an unidentified town.

A screengrab taken on November 9, 2014 from a new Boko Haram video released by the Nigerian Islamist extremist group Boko Haram and obtained by AFP shows Boko Haram fighters parading on a tank in an unidentified town.

Islamists from Nigeria’s Boko Haram killed at least three civilians over the weekend as they attacked six communities in the remote north of neighbouring Cameroun, a defence ministry source told AFP on Tuesday.

“Six attacks were carried out almost simultaneously on Sunday,” the source said on condition of anonymity, adding that at least three people were reported killed in the attacks.

Boko Haram’s five-year insurgency in Nigeria has left thousands dead, and the Islamists have occasionally carried out attacks over the border, including a raid earlier this year blamed on the group that saw 10 Chinese and 17 locals taken hostage. They were released in October.

Cameroun has reinforced its military presence in the region in a bid to stop an escalation in attacks by Boko Haram.