Explosion caused by accumulated gas in six adjoining coal mines in central Cundinamarca department causes casualties and traps 10 workers below ground, authorities say.
Gustavo Petro says negotiations have begun after the suspension of arrest warrants against 19 rebels.
New law passed by leftist President Gustavo Petro would see impoverished or heads of single parent households doing public service instead of spending time in prison.
Dialogue aimed at ending decades of armed conflict in the South American country has made "substantial progress" since two rounds of talks in Venezuela and Mexico, both sides say.
"It gives one chills," says Colombian President Gustavo Petro of new high-security prison built by his El Salvador counterpart Nayib Bukele in "war against gangs."
"We had a comprehensive and very fruitful meeting," says Venezuela's Nicolas Maduro after talks with Colombia's Gustavo Petro in Caracas.
Argentina's Fernandez, Mexico's Lopez Obrador, Colombia's Petro and Bolivia's Arce sign joint statement, calling Castillo a "victim of undemocratic harassment" and demanding "popular will" of Peruvians be respected.
Venezuela had completely blocked its border with its neighbour three years ago, when President Nicolas Maduro broke off diplomatic ties after the previous Colombian government questioned his re-election.
The rainy season that began in August is Colombia's worst in 40 years, causing a series of accidents that have already left more than 270 people dead.
The pact is the first significant achievement in nearly two weeks of peace talks in Venezuela.
The aim is to confront criminal groups operating internationally with a focus on various illegal industries, which requires collaboration with other countries, the interior minister said.
President Gustavo Petro's government and leftist guerrilla group, the National Liberation Army, also agreed to invite Brazil, Chile, and Mexico to join Norway, Cuba, and Venezuela as guarantors of process.
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