Colombia's Farc rebels have declared a month-long unilateral ceasefire, after an increase in violent incidents between the group and the government in recent weeks.
Chief negotiator of the group at talks with the government, Ivan Marquez, said he hoped the ceasefire, starting on 20 July, could lead to a bilateral truce.
Mr Marquez said the truce would "create favourable conditions in order to advance with the opposing side toward a bilateral and definitive ceasefire."
The government welcomed the move but said more was needed.
"We appreciate the gesture of a unilateral ceasefire by the Farc but more is needed, especially concrete commitments to speed up the negotiations," President Juan Manuel Santos said in a tweet.
The talks in the Cuban capital Havana began in November 2012, are aimed the decade long conflict, but they have seen numerous setbacks with repeated clashes and bombing raids. The negotiations continued despite the violence.