The governor of Cameroon's Far North province says that two teen female suicide bombers detonated explosives in a town in the area killing at least six people.

Midjiyawa Bakary said Wednesday that soldiers killed a third suicide bomber before she attacked. He said the attackers came from Nigeria into the border town of Waza late Tuesday.

Senior military official Col. Jacob Kodji on Wednesday said Nigeria's Boko Haram extremists have been using teenage suicide bombers and planting land mines.

He said two Cameroonian soldiers were killed Monday by a land mine planted by militants in the village of Gangse in northern Cameroon. Boko Haram has expanded attacks into Cameroon, Chad and Niger — all countries contributing troops to a regional force intended to wipe out the extremists.