Heavy fighting in south-west Colombia on Saturday left two soldiers and one guerrilla dead, authorities say.
According to the Colombian navy, the fighting took place in Tumaco, a town on the Pacific coast of the troubled Nariño department.
A total of 1,000 troops were sent to regain full control of the region. Another 4,000 are guarding the highway connecting Tumaco and the department capital Nariño.
The Nariño department, because of its proximity to Ecuador and its access to the Pacific ocean, has a high number of leftist guerrillas and drug gangs.