In 1985, the Nevado del Ruiz volcano erupted, killing 23,000 people in Colombia and wiping out the town of Armero. Now, authorities warn, the volcano could be ramping up to erupt again.
Experts say the volcano is showing signs of increased activity, which haven’t been observed since the tragedy in the 1980s. As a result, the alert level has been raised from yellow to orange, the second-highest level on the scale and residents on the upper slopes of the volcano are being evacuated.
