Salvatore Mancuso, former commander of right-wing paramilitary groups, has offered four days of tribunal testimony.
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Colombian President Gustavo Petro hails reopening as a victory, while experts say more must be done to improve security.
Ivan Velasquez has gone head-to-head with Pablo Escobar, local paramilitaries and disgraced Guatemalan politicians.
Colombia says its soldiers ‘neutralised’ FARC rebels in Puerto Leguizamo; rights groups say civilians were killed.
Longtime activist has achieved stunning successes in world’s most dangerous country for environmental defenders.
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The crash in illicit fuel trade left thousands of people unable to make a living, say Colombian police.