Videos filmed by local people showed streaks of light in the sky with the sound of loud explosions, while other images showed flames several metres high and charred cars.
Over a quarter of a million people have been killed during six decades of armed conflict between left-wing guerrillas, drug traffickers, paramilitaries, and the military in Colombia.
Iranian authorities acknowledge that thousands were killed during the protests, giving a toll of more than 3,000 people, but say the majority were members of the security forces or bystanders killed by "rioters".