Nevado del Ruiz volcano prompts evacuations and raised alert levels in Colombia.

Families living on the upper slopes of the Nevado del Ruiz volcano in Colombia are being evacuated after an increase of seismic activity. Colombia's Geological Service (SGC) has raised the alert level from yellow to orange, warning that an eruption bigger than any in the past 10 years could occur in the coming days or weeks. In 1985, a powerful eruption of the volcano triggered mudslides that engulfed the town of Armero, killing about 25,000 residents. The nearby Los Nevados natural park has been closed to tourists, and schools in the area will switch to online classes.