The United States has designated both the FARC and the ELN as foreign terrorist organizations.
The ELN's announcement, however, is seen as an unexpected boost for Colombia's stalled peace process.
Founded in 1965, the ELN takes its inspiration from the Cuban revolution and liberation theology.
Clashes between the Farc and the ELN have been intensifying since the beginning of the year.
He missed a good deal of ELN's eventual run-up but he stuck to his convictions.
Colombian President Juan Manuel Santos demanded the ELN free all of those it held immediately.
ELN's central command, and said that these attacks had undermined the talks in Geneva.
ELN, was once influential in the area, but is now seeking peace with the government.
The recent case with Elan ( NYSE:ELN) and insider trading, is troubling indeed.
Contact between the ELN and the Colombian Government broke down in August, but resumed in November.
Police blamed the morning attacks on the National Liberation Army, or ELN, Colombia's second largest guerrilla force.
He denied that the ELN itself had been involved in the abduction of three people in eastern Antioquia Department.
Peasant leaders, allegedly under the influence of the ELN, complained they were overworked and underpaid and demanded higher salaries.
Dublin, Ireland-based biopharmaceutical company Elan (nyse: ELN - news - people ) topped the sell list.
ELN, the second guerrilla group to whom officials say they may soon talk.
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It is fair to say, however, that neither FARC nor ELN have surrendered to the peace and justice act provisions.
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The government said it would not hold talks with the ELN unless if showed "acts of peace" rather than words.
But the ELN, which is believed to have some 3, 000 fighters, has refused to discuss an end to its campaign.
Defence Minister Gabriel Silva said Colombian intelligence agencies had also gathered grid references of Farc and ELN rebel camps there.
This will put the ELN within striking distance of the country's largest oil refinery and its principal waterway, highway and railway.
President Uribe has accused Senator Piedad Cordoba, who is in the opposition party, of having ties to the ELN and FARC terrorists.
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The government said it would not enter negotiations unless the ELN was willing to show "acts of peace" rather than just words.
The ELN (National Liberation Army) is Colombia's second largest rebel group after the Farc, which has declared a ceasefire until 20 January.
The military says German Briceno, alias Grannobles, told his fighters that they were engaged in a fight to the last against the ELN.
The statement came three weeks after the ELN kidnapped a group of employees of an international mining firm, also in Norte de Santander province.
When the ELN ceasefire was originally declared, it was greeted by government peace negotiator Camilo Gomez as a "show of its interest to move forward".
ELN, the smaller guerrilla group, and a team of Colombian worthies.
Dublin, Ireland-based Elan (nyse: ELN - news - people ) will also part with 400 sales representatives under the terms of the deal.
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