Five Colombian soldiers were killed by the FARC, a final package on the eve of the start of their unilateral cease-fire.
The soldiers were ambushed in a rural area of western Colombia and fighting broke out.
The government, he ruled out any military truce before a final agreement with the FARC. The Colombian army remains on the offensive.
Juan Manuel Santos, Colombian President:
"These men before us, are not angels, then we will analyze the development and progression of the cease-fire, which is, I think, a good first step."
Discussions for sustainable, especially bilateral cease-fire is still ongoing under the auspices of Havana. The conflict has made half a century 220,000 people and more than 5 million displaced, according to official figures.