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10 soldiers killed in apparent rebel attack that could jeopardize Colombia peace talks

FILE - In this April 10, 2015, file photo, Colombia's President Juan Manuel Santos waves after delivering his speech during the CEO Summit of the Americas in Panama City. Colombia’s president ordered,on Wednesday, April 15, 2015, the resumption of air raids on rebel camps after an attack by leftist guerrillas killed 11 soldiers and wounded 19, jeopardizing progress in two-year-old peace talks. (AP Photo/Moises Castillo, File)

FILE - In this April 10, 2015, file photo, Colombia's President Juan Manuel Santos waves after delivering his speech during the CEO Summit of the Americas in Panama City. Colombia‚Äôs president ordered,on Wednesday, April 15, 2015, the resumption of air raids on rebel camps after an attack by leftist guerrillas killed 11 soldiers and wounded 19, jeopardizing progress in two-year-old peace talks. (AP Photo/Moises Castillo, File)  (The Associated Press)

Colombia's army says 10 soldiers were killed and 20 injured in an apparent attack by leftist rebels that could jeopardize the future of peace talks.

The army's third division says in a statement that soldiers were on a routine patrol in the volatile southwestern department of Cauca when they were ambushed around midnight Tuesday by a guerrilla unit of the Revolutionary Armed Forces of Colombia.

President Juan Manuel Santos offered his condolences to the family members of the victims and said via Twitter that, "This is precisely why we want to end the war."

Rebel negotiators in Cuba pledged in December to observe a unilateral ceasefire to promote peace talks taking place on the communist-led island. The government has responded by suspending all aerial attacks on guerrilla encampments.