Discuss as:

Colombia army: At least 20 FARC guerrillas killed amid peace talks

BOGOTA, Colombia -- Colombian forces have killed at least 20 Marxist FARC guerrillas in air and ground attacks near the border with Ecuador, an army general said Monday, the deadliest strike against rebels since the latest peace process started.

Despite talks to end 50 years of war, Colombia's government has vowed to keep up military operations even while the Revolutionary Armed Forces of Colombia, or FARC, called a two-month ceasefire as the two sides try to hash out a deal.

Colombian President Juan Manuel Santos is hoping a decade of U.S.-backed blows against the FARC has left the group sufficiently weakened to seek an end to the war.

In the most deadly attack since the two warring sides started negotiations in mid-October, an airstrike followed by a ground assault on three FARC camps in the southwestern Narino department killed at least 20 rebels late Sunday.

An end to war? Colombian government seeks peace with FARC rebels

"On the strength of the attack we found human remains that are in the process of being identified. We're talking about more than 20 dead, but the figure could be higher," Gen. Leonardo Barrero, head of the Joint Command Southwest, told Reuters.

Barrero said that security forces have so far been able to identify six of the bodies.

Narino is a microcosm for a range of problems facing Colombia -- weak government presence, drug production, poverty, and the presence of guerrillas and new criminal gangs that sometimes fight, sometimes become allies.

Ingrid Betancourt, a former senator and presidential candidate in Colombia, was abducted by FARC guerrillas and spent more than six years in captivity. She speaks about surviving the ordeal and her new book, "Even Silence Has an End."

Colombia 'milestone' as FARC frees captives after over a decade

'Months, not years'
Peace talks, which are taking place in Cuba, are trying to tackle some of the root causes of the conflict such as agrarian development, drugs, political participation of opposition groups and victims' reparations.

Santos said at the weekend that the discussions should not drag on for too long and said they must be completed by November next year or earlier. The rebels have said they would remain at in negotiations as long as necessary.

French journalist captured by FARC after being dropped into jungle

After a short break from the first round of discussions in Havana about rural development, negotiating teams are expected to resume talks this week.

Both sides have said negotiations were going as expected.

"Last night I met with my negotiating team. The balance of the first meeting was positive. No one is thinking about modifying timeliness. Months, not years," Santos said Monday in a message to his 1.4 million Twitter followers (in Spanish).

More world stories from NBC News:

Follow World News from NBCNews.com on Twitter and Facebook