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National Terrorism Advisory System (NTAS)

In 2011, the Department of Homeland Security (DHS) replaced the color-coded alerts of the Homeland Security Advisory System (HSAS) with the National Terrorism Advisory System (NTAS), designed to more effectively communicate information about terrorist threats by providing timely, detailed information to the American public.

It recognizes that Americans all share responsibility for the nation's security, and should always be aware of the heightened risk of terrorist attack in the United States and what they should do.

This page also contains any current NTAS advisories and archived copies of expired advisories.

The NTAS Advisory – How can you help?

NTAS advisories – whether they be Alerts or Bulletins – encourage individuals to follow the guidance provided by state and local officials and to report suspicious activity. Where possible and applicable, NTAS advisories will include steps that individuals and communities can take to protect themselves from the threat as well as help detect or prevent an attack before it happens. Individuals should review the information contained in the Alert or Bulletin, and based upon the circumstances, take the recommended precautionary or preparedness measures for themselves and their families.

Individuals should report suspicious activity to local law enforcement authorities. Often, local law enforcement and public safety officials will be best positioned to provide specific details on what indicators to look for and how to report suspicious activity. The “If You See Something, Say Something®” campaign across the United States encourages the public and leaders of communities to be vigilant for indicators of potential terroristic activity, and to follow the guidance provided by the advisory and/or state and local officials for information about threats in specific places or for identifying specific types of suspicious activity.

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Action Center

Last Published Date: October 3, 2019

Current Advisories

There are no current advisories.

Expired Advisories

Bulletin

National Terrorism Advisory System Bulletin - January 18, 2020 (pdf, 1 page, 881.82 KB) View web version

Iran likely views terrorism as an option to deter or retaliate against its perceived adversaries. At this time, we have no information indicating a specific, credible threat to the Homeland; however, we remain concerned about Iran’s potential to carry out cyber attacks. Additionally, Iran and its partners, such as Hizballah, have demonstrated their capability to conduct various operations in the U.S.

Effective: 2020-01-18 05:00 pm. Expires: 2020-03-18 01:00 pm. *Alert Dates are Eastern Time*

National Terrorism Advisory System Bulletin - January 4, 2020 (pdf, 1 page, 641.01 KB) View web version

The United States designated Iran a “State Sponsor of Terrorism” in 1984 and since then, Iran has actively engaged in or directed an array of violent and deadly acts against the United States and its citizens globally.  The United States designated Iran’s Islamic Revolutionary Guard Corps (IRGC) a Foreign Terrorist Organization on April 15, 2019 for its direct involvement in terrorist plotting.

Effective: 2020-01-04 05:15 pm. Expires: 2020-01-18 01:00 pm. *Alert Dates are Eastern Time*

National Terrorism Advisory System Bulletin - July 18, 2019 (pdf, 1 page, 243.27 KB) View web version

Since 2015, the Department of Homeland Security (DHS) has used this Bulletin to highlight the continuing terror threat to the U.S. Homeland. The United States is engaged in a generational fight against terrorists who seek to attack the American people, our country, and our way of life. An informed, vigilant and engaged public remains one of our greatest assets to identify potential terrorists and prevent attacks.

Effective: 2019-07-18 01:00 pm. Expires: 2020-01-17 01:00 pm. *Alert Dates are Eastern Time*

National Terrorism Advisory System Bulletin - January 19, 2019 (pdf, 1 page, 263.74 KB) View web version

Since 2015, the Department of Homeland Security (DHS) has used this Bulletin to highlight the continuing terror threat to the U.S. Homeland. The United States is engaged in a generational fight against terrorists who seek to attack the American people, our country, and our way of life. An informed, vigilant and engaged public remains one of our greatest assets to identify potential terrorists and prevent attacks.

Effective: 2019-01-18 02:00 pm. Expires: 2019-07-18 01:00 pm. *Alert Dates are Eastern Time*

National Terrorism Advisory System Bulletin - September 14, 2018 (pdf, 1 page, 225.53 KB) View web version

Since 2015, the Department of Homeland Security (DHS) has used this Bulletin to highlight the continuing terror threat to the U.S. Homeland. The United States is engaged in a generational fight against terrorists who seek to attack the American people, our country, and our way of life. An informed, vigilant and engaged public remains one of our greatest assets to identify potential terrorists and prevent attacks.

Effective: 2018-09-14 12:00 am. Expires: 2019-01-18 12:00 am. *Alert Dates are Eastern Time*

National Terrorism Advisory System Bulletin - May 9, 2018 (pdf, 1 page, 177.47 KB) View web version

Since 2015, the Department of Homeland Security (DHS) has used this Bulletin to highlight the continuing terror threat to the U.S. Homeland. The United States is engaged in a generational fight against terrorists who seek to attack the American people, our country, and our way of life. An informed, vigilant and engaged public remains one of our greatest assets to identify potential terrorists and prevent attacks.

Effective: 2018-05-09 12:00 am. Expires: 2018-09-14 12:00 am. *Alert Dates are Eastern Time*

National Terrorism Advisory System Bulletin - November 9, 2017 (pdf, 1 page, 185.91 KB) View web version

Since 2015, the Department of Homeland Security (DHS) has used this Bulletin to highlight the continuing terror threat to the U.S. Homeland. The United States is engaged in a generational fight against terrorists who seek to attack the American people, our country, and our way of life. An informed, vigilant and engaged public remains one of our greatest assets to identify potential terrorists and prevent attacks.

Effective: 2017-11-09 12:00 am. Expires: 2018-05-08 12:00 am. *Alert Dates are Eastern Time*

National Terrorism Advisory System Bulletin - May 15, 2017 (pdf, 1 page, 608.02 KB) View web version

Since 2015, the Department of Homeland Security (DHS) has used this Bulletin to highlight the continuing threat from homegrown terrorists, many of whom are inspired online to violence by foreign terrorist organizations. The United States is engaged in a generational fight against terrorists, who seek to attack the American people, our country, and our way of life. An informed, vigilant, and engaged public remains one of our greatest assets to identify potential homegrown terrorists and prevent attacks.

Effective: 2017-05-15 12:00 am. Expires: 2017-11-09 12:00 am. *Alert Dates are Eastern Time*

National Terrorism Advisory System Bulletin - November 15, 2016 (pdf, 1 page, 171.64 KB) View web version

Since the last NTAS Bulletin issued in June 2016, our basic assessment of the global threat environment has not changed. We remain concerned about homegrown violent extremists who could strike the homeland with little or no notice. Events since the last NTAS Bulletin reinforce this. Accordingly, increased public vigilance and awareness continue to be of utmost importance. This was, for example, a crucial component of the swift response to the September terrorist acts in New York City and New Jersey.

Effective: 2016-11-15 12:00 am. Expires: 2017-05-15 12:00 am. *Alert Dates are Eastern Time*

National Terrorism Advisory System Bulletin - June 15, 2016 (pdf, 1 page, 876.65 KB) View web version

In December, we described a new phase in the global threat environment, which has implications on the homeland. This basic assessment has not changed. In this environment, we are particularly concerned about homegrown violent extremists who could strike with little or no notice. The tragic events of Orlando several days ago reinforce this. Accordingly, increased public vigilance and awareness continue to be of utmost importance. This bulletin has a five-month duration and will expire just before the holiday season. We will reassess the threats of terrorism at that time.

Effective: 2016-06-15 12:00 am. Expires: 2016-11-15 12:00 am. *Alert Dates are Eastern Time*

National Terrorism Advisory System Bulletin - December 16, 2015 (pdf, 1 page, 756.59 KB) View web version

We are in a new phase in the global threat environment, which has implications on the homeland.  Particularly with the rise in use by terrorist groups of  the Internet to inspire and recruit, we are concerned about the “self-radicalized” actor(s) who could strike with little or no notice. Recent attacks and attempted attacks internationally and in the homeland warrant increased security, as well as increased public vigilance and awareness.

Effective: 2015-12-16 12:00 am. Expires: 2016-06-15 12:00 am. *Alert Dates are Eastern Time*

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