May 15, 1934 - Campo Elías Delgado
A Vietnam War veteran who turned the methodical discipline of military training toward mass violence, Delgado moved through three locations over seven hours with deliberate precision — beginning with his own household and ending in a crowded restaurant. The scale of the attack, 29 dead in a single evening, remains without parallel in Colombian history as the work of a single gunman. What distinguishes the case is less the brutality than the planning: the staged fire alarm, the sequencing of targets, the prolonged duration before police intervention.
From Wikipedia
The Pozzetto massacre was carried out by the same perpetrator at three locations in eastern Bogotá, Colombia on 4 December 1986. Over the course of seven hours, 29 people were killed and 11 others were injured by 52-year-old Campo Elías Delgado.
Delgado first murdered nine people, including his mother, at two apartment buildings, luring some out by triggering the fire alarm system. Afterwards, he went to the upscale Restaurant Pozzetto, where Delgado opened fire on customers and staff, killing 20 people before being shot dead by police. It is currently the deadliest shooting by a lone gunman in the country's history.
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