A faction of FARC dissidents in Colombia's Catatumbo region (a volatile area in the country's northeast, bordering Venezuela) has told Al Jazeera they returned to armed conflict after a landmark peace agreement failed to deliver promised security and social reforms. The group is currently fighting rival armed factions for control of territory and lucrative drug trafficking routes in the region. The statement underscores the fragility of Colombia's 2016 peace process, which demobilised the main FARC guerrilla force but left splinter groups active across the country.