A suicide bombing by a Boko Haram jihadist has killed 11 people in northern Cameroon, a provincial governor said Thursday, warning civilians not to breach special security measures aimed at preventing such attacks.

It was the latest in a spate of raids blamed on the Nigeria-based Islamist militant group in the area, which have driven tens of thousands of people from their homes.

A security source said the attacker blew himself up in the town of Djakana near the Nigerian border overnight.

"Seven people were killed immediately, including the bomber," the source said, adding that most of the victims were members of a local vigilante group tasked with hunting down Boko Haram fighters.