The Colombian military has killed at least five FARC guerrillas in the northwest of the country, part of a new offensive that has challenged ongoing peace talks with the rebel group.
A bombing in the remote Choco department killed the fighters, military sources told AFP, but they were unable to provide more details about the attack.
The government has intensified military operations against the Revolutionary Armed Forces of Colombia (FARC) in recent days even as bilateral peace talks continue in Havana.
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The FARC suspended its unilateral ceasefire policy Friday and briefly broke off the scheduled talks after a strike last week killed 26 rebels.
FARC leader Pablo Catatumbo condemned the strikes as a "step backward" as the Marxist group resumed talks in Cuba with the Colombian government Monday.
Santos rules out any ceasefire before a final peace agreement is reached, but he recently ordered that the names of rebels killed be released, breaking practice with usual government policy.
Founded in 1964, the FARC has some 8,000 fighters mostly in rural areas.
Colombia's internal conflict, which has dragged on for decades, has killed some 220,000 people and left some five million displaced.