The Colombian President has said that his forces have arrested a former peace negotiator for the FARC, the ex-rebel-group-turned-political-party.
Former rebels and FARC sympathisers gathered outside the prosecutors' bunker on Monday demanding Hernandez's release.
Santrich and three co-conspirators who were also detained were indicted by a NY grand jury for allegedly planning to traffic a cocaine shipment with a street value of $320m to the US.
Seusis Hernandez, known by his nom de guerre Jesus Santrich, was arrested for conspiring to export 10 tonnes of cocaine, worth $320 million, to the US.
However, the rebels consistently refused direct involvement in the business itself and rebel peace negotiators in 2013 denounced drug trafficking like a "scourge" that has "contaminated" the worldwide economic climate and also generated a global health catastrophe.
The arrest of 51-year-old Hernandez, best known by his alias Jesus Santrich, has rocked the already fragile peace process in Colombia.
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Authorities from Interpol said in a statement that Santrich met with a cocaine distributor last November in Bogotá where they discussed the shipment of the 10-ton product to the U.S. Attorney General Nestor Humberto Martinez said that evidence in the case indicates that Santrich committed the crimes after the 2016 peace accord was signed.
After the Revolutionary Armed Forces of Colombia disarmed past year, the group announced the formation of a political party.
The former guerrillas fear that President Juan Manuel Santos will bypass the transitional justice system which, according to the peace agreement, must approve any extradition request. The government says Hernandez's alleged crimes took place after the deal was signed. "It's a very bad message for the Colombian people, for the former combatants and for the peace that our country so badly needs". However, they're not secure for offenses perpetrated after the December 2016 signing.
"This really is the most peculiar time which the peace process goes", claimed the prior rebel chief called Ivan Marquez, who functioned as main negotiator during the peace talks.
Even before information on the arrest were known, FARC leaders condemned it because a setup that could endanger almost 7,000 demobilized rebel fighters' faith in the peace procedure. The FARC long funded itself by leveling a "war tax" on cocaine moving through territory it dominated, and 50 members of its leadership structure - though not Santrich - were indicted in 2006 in the USA on charges of running the world's largest drug cartel.