Video: Mexico’s Most Active Volcano Erupts, Spews Ash Cloud Nearly 20,000 Feet

Officials say threat levels are at a "yellow phase 2," and are warning people to stay away from the volcano and its crater "due to the danger of falling ballistic fragments."

The dramatic explosion of Popocatépetl, about 40 miles south of Mexico City, sent columns of ash and debris shooting into the sky.

(Image credit: webcamsdemexico)