Two teen female suicide bombers detonated explosives in a north Cameroon town, killing at least six people, the governor of Cameroon's Far North province said Wednesday.

Soldiers killed a third suicide bomber before she could attack in the town of Waza late Tuesday, said governor Midjiyawa Bakary.

“We have reliable information the attackers came from Nigeria,” Bakary said. Senior military official Col. Jacob Kodji on Wednesday said Nigeria's Boko Haram extremists have been using teenage suicide bombers and planting land mines.

Two Cameroonian soldiers were killed Monday by a land mine planted by militants in the village of Gangse in northern Cameroon, Kodji said.

Boko Haram’s 6-year uprising has killed some 20,000 people. The Islamic extremist group has expanded attacks into Cameroon, Chad and Niger — all countries contributing troops to a regional force intended to wipe out the extremists. (AP)

•Photo shows scene of a Boko Haram attack.