The arms were located by Joint Taskforce Omega troops conducting counterinsurgency operations in a rural area near Cartagena del Chaira, a jungle town in Caqueta, the army said.
The arsenal, which apparently belonged to the Southern Bloc of the Revolutionary Armed Forces of Colombia, or FARC, was located thanks to a tip from demobilized members of the guerrilla group.
Soldiers also found 20 mortar rounds, 1,000 detonators, 2,500 meters (2,735 yards) of detonating cord, 214 ammunition clips for rifles and two tons of provisions.
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