The army said that the attack took place early Tuesday when a homemade explosive ripped apart a passing truck carrying the soldiers near the rural town of Tibu.
The army attributed the attack to the National Liberation Army, the largest remaining rebel movement following a peace deal in 2016 with the much-larger Revolutionary Armed Forces of Colombia.
The ELN, as the group is known, announced Monday it would unilaterally suspend all offensive operations March 9 in time for congressional elections.
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