The highest active volcano in Colombia erupted Monday night , prompting authorities to order the evacuation of up to 15,000 people . Darkness made it difficult to gauge time of latest eruption . Highest active volcano in Colombia erupted , forcing thousands to flee . Officials worried about possible flooding , debris flows and rising river levels .
Darkness made it difficult to gauge time of latest eruption . Highest active volcano in Colombia erupted , forcing thousands to flee . Officials worried about possible flooding , debris flows and rising river levels .