News Articles:
Popocatépetl Volcano Alert goes to Phase 3, just one level from mandatory evacuations
http://newsdoors.blogspot.com/2013/07/popocatepetl-volcano-alert-goes-to.html
Popocatépetl volcano (Mexico): alert level raised
http://www.volcano-news.com/popocatep…
Alert raised for Mexico’s Popocatepetl volcano
http://updatednews.ca/2013/07/07/aler…