FORT RUCKER, Ala. -- Last month, the Department of Homeland Security transitioned from the old, color-coded Homeland Security Advisory System to the National Terrorism Advisory System.

The NTAS includes information only specific to a particular and credible threat, along with a clear statement that there is an imminent threat or elevated threat.

NTAS Alerts contain a sunset provision, indicating a specific date when the alert automatically expires - there will not be a constant NTAS Alert or blanket warning as seen in the past.

If threat information changes for an alert, the Secretary of Homeland Security may announce an update. All changes, including the announcement that cancels an NTAS Alert, will be distributed the same way as the original alert.

Terrorism information and intelligence is based on the collection, analysis and reporting of a range of sources and methods. While intelligence may indicate that a threat is credible, specific details may not be known.

In making the change over to NTAS, the Department of Homeland Security can provide a more concise summary of the potential threat, public safety, and recommended steps that individuals, communities, businesses and governments can take to help prevent, mitigate or respond to the threat.

DHS encourages citizens to follow NTAS Alerts for information about threats and take an active role in security by reporting suspicious activity to local law enforcement authorities through the "If You See Something, Say Something" public awareness campaign.

For more information on the National Terrorism Advisory System or to receive NTAS alerts, visit