Chad announced 23 soldiers were killed by Boko Haram militants overnight on March 22nd in the town of Dangdala, near the banks of Lake Chad, two security sources told Reuters.
The incident appeared to be the deadliest attack inside Chad by insurgents of Boko Haram, who have been fighting for a decade to carve their alleged caliphate out of northeastern Nigeria and have carried out regular raids into neighbouring Chad, Niger and Cameroon, thanks to lax border enforcement.
One of them added that the assailants were believed to have crossed the frontier from Niger before attacking Chadian soldiers around 1:25 am (0025 GMT). An army spokesman declined to comment.
Chadian soldiers are part of a US-trained West African task force deployed to counter Boko Haram. The violence over the past decade has killed more than 30,000 people and forced about two million to leave their homes.