Two girls between the ages of 13 and 17 carried out suicide bombings in the northern Cameroon village of Kangeleri near Mora town today, killing at least 9 and wounding 29 others, said Cameroon's Minister of Communications Issa Tchiroma Bakary.
The Cameroon explosions come after five coordinated suicide bombings in neighboring Chad on Saturday killed at least 36 people and wounded some 50 others in a village near Lake Chad that is home to thousands of Nigerians who have fled the extremists' violence.
The use of girls and women in recent suicide bombings in Nigeria, Chad, Cameroon and Niger raises fears that Boko Haram is using kidnap victims to target countries that are helping combat the rebels.
"They have shifted their tactics. They have noticed it is impossible to face our forces, so they are now using young girls or young boys with explosives, who go more undetected, in areas they are told to go," said Bakary.
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He added it is difficult to know if the young girls know that they will die. "We guess that they use the girls who were kidnapped here and there, they brainwash them and use them."
Boko Haram members are trying to spread terror, after pledging allegiance to the Islamic State group earlier this year, said Bakary.
"As a token of their commitment they have to act," he said. "This is to prove to their master how determined they are. This is the best way to receive money."
The shift also comes as Nigeria and its neighbors prepare to launch a multinational force. Earlier this year Chadian troops helped Nigerian forces drive Boko Haram out of towns and villages in northeastern Nigeria where it had set up a so-called Islamic caliphate.
Bakary called for more community self-defense groups, with people trained to neutralize the attackers, until the multinational force is fully prepared.