Story highlights FARC leaders announce an end to unilateral ceasefire

The announcement follows a military raid on a FARC outpost

The government says the rebels had already violated their ceasefire

(CNN) The Revolutionary Armed Forces of Colombia -- or FARC -- who have been engaged in peace talks with the Colombian government for more than two-and-a-half years, has lifted the unilateral ceasefire it announced in December, the rebel group announced Friday.

But though some hostilities have resumed, both sides say they will continue to take part in negotiations to end the conflict.

The peace talks are being held in Cuba, with the goal of bringing an end to the leftist FARC's war against the government, which began in the 1960s, making it the longest-running insurgency in Latin America.

Good resource from @WOLA_org: Comprehensive timeline of Colombia's peace talks with the FARC http://t.co/e0PiJRMVxZ — Mariano Castillo (@marianoCNN) May 22, 2015

"It was not in our plans to suspend the unilateral and indefinite ceasefire proclaimed on December 20, 2014 as a humanitarian gesture of de-escalation of the conflict," the FARC said in a statement.

The group blamed the "inconsistency" of President Juan Manuel Santos' government and its attacks on FARC outposts for its decision to end the ceasefire.

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