Boko Haram Landmine Kills 4 Chadian Soldiers
About 12 other soldiers were wounded.
The incident is the latest in the series of attacks on Chadian soldiers by Boko Haram extremists.
The Nigerian-based Boko Haram wants to create a breakaway Islamic state in the region and once occupied an area the size of Belgium.
But a regional offensive led by Nigeria, Chad, Cameroon and Niger – the four countries most affected by Boko Haram – has chased it out of much of that territory.