At least four Chadian soldiers died after their patrol vehicle ran over a landmine planted by Boko Haram in the Lake Chad regional town of Kaiga Kindji.
Chad is part of a coalition of four countries fighting to crush the group seeking to establish an Islamic caliphate in the region.
The fighting has killed more than 20,000 people since 2009 and has plunged Nigeria’s northeast into a humanitarian crisis.
Boko Haram, which roughly translates to ‘Western education is forbidden,’ came to the limelight after abducting more than 200 girls from their high school dorm.
Nigeria’s army last week said it has killed scores of its fighters with senior commanders and wounded many including the group’s leader Abubakar Shekau in an air raid on Sambisa forest.
President Muhammadu Buhari who declared a technical win over the ISIS affiliate group said Boko Haram can choose a non-profit institution as an intermediary in negotiations for the release of the school girls kidnapped from Chibok.
Buhari won Nigeria’s presidential poll on a strong promise to strengthen security and reuniting the girls with their families. The country’s failure to secure the release of the girls, whether by negotiation or military action, has caused a backlash.
Boko Haram wants its fighters and some of its leaders captured by Nigerian forces to be released in exchanged for the girls and said some of the girls are injured and physically impaired due to airstrikes by Nigeria’s defense forces.