Troops from Chad have driven Boko Haram fighters from a northern Nigeria border town seized by the Islamist militants late last year, military sources in Niger said on Thursday.
A Chadian military source said 123 Boko Haram fighters were killed in clashes with Chadian soldiers, who sustained three deaths. A dozen soldiers were injured.
Chad's involvement in retaking the town comes as the regional military heavyweight assumes an increasingly aggressive role in combating the militants and regional leaders weigh new options for containing the movement's spread.
Boko Haram has killed thousands in its struggle to create an Islamic state in northern Nigeria.
It seized the town of Malam Fatori in November, sending government soldiers stationed there fleeing across the nearby border into Niger.