Colombian scientists monitoring Nevado del Ruiz had cautioned town leaders of Armero about the volcano's increased activity and even radioed urgent messages on the night of the eruption.

After the Volcanological and Seismological Observatory declared a yellow alert on the Nevado del Ruiz volcano due to ... the cameras installed in the volcano area and the report of officials ...

During the last few days, volcanic activity was recorded in Nevado del Ruíz, seismic movements ... They indicated that the earthquakes occur in the volcano's area of influence and yesterday's ...

After the eruption of Nevado del Ruiz killed ... and destroy a certain area. When will forecasting get better? It's improving year by year. Every time we work on a volcano crisis, we learn more ...

BOGOTA, Colombia (CNN)-- Colombian emergency officials have begun evacuating 800 families from an area ... eruption of a volcano that killed at least six people in November. The Nevado del Huila ...

The 1985 Nevado del Ruiz stratovolcano eruption killed over 22,000 people from the surrounding area, triggering pyroclastic flows which ... She died on 16 November, three days after the volcano ...

A lahar is a fast-moving debris flow The deadliest lahar in recent memory was in November 1985 when Colombia’s Nevado del Ruiz volcano erupted. Just a couple hours after the eruption started ...