13 January 2013 Last updated at 20:12 ET

Colombia negotiator says Farc talks must 'pick up pace'

Colombian peace negotiator, Humberto de la Calle

De la Calle said negotiations on land reform were at an advanced stage

The chief Colombian government negotiator has said he wants to speed up the pace of peace talks with Farc rebels.

"We must move ahead with responsibility but at faster pace," said Humberto de la Calle as he left for Cuba where negotiations are set to resume.

The talks, aimed at ending four decades of conflict in Colombia, have focused initially on land reform.

The rebels have declared a unilateral ceasefire, but clashes have continued.

The Farc ceasefire expires on 20 January.

The Colombian government refused to cease military operations during the talks, saying rebels would use the opportunity to rearm.

President Juan Manuel Santos's government has stated that both sides must come to an agreement by November.

'Realistic approach'

"The government negotiating team is fully aware that the country is longing for a peaceful solution," said Mr La Calle.

"That is why we have been taking a realistic approach and making sure we do not create false expectations over the outcome of the talks."

The rebels have rejected the government deadline. They say the issues are too complex.

Ivan Marquez says no timetables can be set

Both sides "will have to take as long as necessary to reach peace," chief Farc negotiator Ivan Marquez said.

The talks will also focus on four other issues:

the end of armed conflict
guarantees for political opposition and citizen participation
drug trafficking
the rights of victims of the conflict.

The negotiations were launched in Norway on 18 October, before moving to the Cuban capital a month later.

According to government estimates, more than 600,000 people have been killed in the conflict in Colombia since the Farc (Revolutionary Armed Forces of Colombia) was founded in 1964.

The Colombian government says the final aim of the negotiations is to get the rebels to abandon their armed struggle and join the legal political process.