When the Nevado del Ruiz volcano in Colombia erupted it killed around 20,000 of the 29,000 residents in the town of Armero and left the place devastated.
The death toll from the surrounding areas brought the loss of life up to 25,000, and the town ended up being abandoned altogether.
One of the reasons why this volcanic eruption is thought to have been so deadly is because the eruption melted glaciers on the mountain, creating a pyroclastic mudflow known as a 'lahar'.It's thought that the town of Armero was hit by three of these events, which took the lives of more townspeople who had survived the initial eruption.
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