One Colombian soldier was killed and four injured after an attack by renegade members of the FARC rebel force acting in defiance of a peace accord, authorities said.
A vehicle carrying military personnel was attacked with an improvised explosive device in the southeastern district of Guaviare, the military said in a statement.
"A soldier lost his life and a non-commissioned officer and two soldiers were injured as a result of the explosion," it said.
It added later that a fifth soldier who went missing after the attack was found and was "receiving all the necessary treatment."
President Juan Manuel Santos said on Twitter that the attack injured four soldiers overall.
"These deeds are attributed to dissidents of the first front of the FARC, who are committing crimes in the region," the military said.
The leftist FARC are disarming under a peace accord signed last year with the government after more than half a century of civil war.
Dissident members opposed to the accord have broken away and clashed with other FARC members as well as with government forces.
The UN-monitored disarmament process is scheduled to be completed by the end of May.
Santos won a Nobel Peace Prize for his work on the accord.
"I condemn the subversive attack in Guaviare," he tweeted.
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