It is not an alert that the end of the world is near.
Emergency sirens will go off at random times throughout the day.
The City and County's Office of Emergency Management and Homeland Security will test nearly 80 new and upgraded warning sirens.
They are aware of all the talk about the Mayan calendar and wanted to make sure people knew the sirens are only a test and not a warning.
(KUSA-TV © 2012 Multimedia Holdings Corporation)