Yaound - Thirteen Chadian soldiers were killed on Wednesday in a counter-attack by Boko Haram militants on the Cameroonian border town of Fotokol, Cameroon's defence minister said.
"After finishing the count in Fotokol, we found 13 Chadian soldiers killed," the minister, Edgar Alain Mebe Ngo'o, said Thursday.
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He also said 81 civilians had been killed, up from a toll of around 70 given Wednesday, and confirmed that six Cameroonian soldiers had died in the fighting.
Boko Haram militants went on a rampage in Fotokol, massacring civilians and torching a mosque before being repelled by regional forces.
The onslaught came a day after Chad sent troops across the border to battle the jihadists in the Nigerian town of Gamboru. Chad's army said it had killed more than 200 Boko Haram militants in the clashes.
African Union leaders have backed plans for a 7,500-strong five-nation regional force to take on the extremists, who control vast swathes of northeast Nigeria.
Nigeria's military has drawn fierce criticism for failing to rein in the insurgents, who have stepped up their campaign of terror in the northeast in the run-up to presidential and parliamentary elections on February 14.