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National Terrorism Advisory System

The National Terrorism Advisory System (NTAS) is designed to communicate information about terrorist threats by providing timely, detailed information to the American public. All Americans 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 contains current NTAS advisories (both Alerts and Bulletins), archived copies of expired advisories, and additional information on the NTAS system.

DHS replaced the color-coded alerts of the Homeland Security Advisory System (HSAS) with the National Terrorism Advisory System (NTAS) in 2011.

Bulletin

The United States remains in a heightened threat environment fueled by several factors, including an online environment filled with false or misleading narratives and conspiracy theories, and other forms of mis- dis- and mal-information (MDM) introduced and/or amplified by foreign and domestic threat actors. These threat actors seek to exacerbate societal friction to sow discord and undermine public trust in government institutions to encourage unrest, which could potentially inspire acts of violence. Mass casualty attacks and other acts of targeted violence conducted by lone offenders and small groups acting in furtherance of ideological beliefs and/or personal grievances pose an ongoing threat to the nation. While the conditions underlying the heightened threat landscape have not significantly changed over the last year, the convergence of the following factors has increased the volatility, unpredictability, and complexity of the threat environment: (1) the proliferation of false or misleading narratives, which sow discord or undermine public trust in U.S. government institutions; (2) continued calls for violence directed at U.S. critical infrastructure; soft targets and mass gatherings; faith-based institutions, such as churches, synagogues, and mosques; institutions of higher education; racial and religious minorities; government facilities and personnel, including law enforcement and the military; the media; and perceived ideological opponents; and (3) calls by foreign terrorist organizations for attacks on the United States based on recent events.

Effective: 2022-02-07 02:00 pm. Expires: 2022-06-07 02:00 pm. *Alert Dates are Eastern Time*

Bulletin

The Secretary of Homeland Security has issued an updated National Terrorism Advisory System (NTAS) Bulletin regarding the current heightened threat environment across the United States. The Homeland continues to face a diverse and challenging threat environment as it approaches several religious holidays and associated mass gatherings that in the past have served as potential targets for acts of violence. These threats include those posed by individuals and small groups engaged in violence, including domestic violent extremists (DVEs) and those inspired or motivated by foreign terrorists and other malign foreign influences. These actors continue to exploit online forums to influence and spread violent extremist narratives and promote violent activity. The ongoing global pandemic continues to exacerbate these threats, in part due to perceived government overreach in implementation of public health safety measures. Further, foreign terrorist organizations and DVEs continue to attempt to inspire potential followers to conduct attacks in the United States, including by exploiting recent events in Afghanistan. As of November 10, 2021, DHS is not aware of an imminent and credible threat to a specific location in the United States.

Effective: 2021-11-10 04:00 pm. Expires: 2022-02-07 01:50 pm. *Alert Dates are Eastern Time*


The Secretary of Homeland Security has issued a new National Terrorism Advisory System (NTAS) Bulletin regarding the current heightened threat environment across the United States.  The Homeland continues to face a diverse and challenging threat environment leading up to and following the 20th Anniversary of the September 11, 2001 attacks as well religious holidays we assess could serve as a catalyst for acts of targeted violence. These threats include those posed by domestic terrorists, individuals and groups engaged in grievance-based violence, and those inspired or motivated by foreign terrorists and other malign foreign influences. These actors are increasingly exploiting online forums to influence and spread violent extremist narratives and promote violent activity. Such threats are also exacerbated by impacts of the ongoing global pandemic, including grievances over public health safety measures and perceived government restrictions.

Effective: 2021-08-13 02:00 pm. Expires: 2021-11-10 03:59 pm. *Alert Dates are Eastern Time*


The Secretary of Homeland Security has issued a new National Terrorism Advisory System (NTAS) Bulletin regarding the current heightened threat environment across the United States.  The Homeland is facing threats that have evolved significantly and become increasingly complex and volatile in 2021. These threats include those posed by domestic terrorists, individuals and groups engaged in grievance-based violence, and those inspired or influenced by foreign terrorists and other malign foreign influences.  Social media and online forums are increasingly exploited by these actors to influence and spread violent extremist narratives and activity.  Such threats also are exacerbated by the impacts from the ongoing global pandemic.

Effective: 2021-05-14 02:00 pm. Expires: 2021-08-13 02:00 pm. *Alert Dates are Eastern Time*


The Acting Secretary of Homeland Security issued a National Terrorism Advisory System (NTAS) Bulletin, subsequently extended by the Secretary of Homeland Security, due to a heightened threat environment across the United States, which DHS believes will persist in the weeks following the successful Presidential Inauguration.  Information suggests that some ideologically-motivated violent extremists with objections to the exercise of governmental authority and the presidential transition, as well as other perceived grievances fueled by false narratives, could continue to mobilize to incite or commit violence.

The expiration date for this Bulletin is extended from April 30, 2021 to May 15, 2021.

Effective: 2021-01-27 11:00 am. Expires: 2021-05-14 02:00 pm. *Alert Dates are Eastern Time*


The Acting Secretary of Homeland Security has issued a National Terrorism Advisory System (NTAS) Bulletin due to a heightened threat environment across the United States, which DHS believes will persist in the weeks following the successful Presidential Inauguration.  Information suggests that some ideologically-motivated violent extremists with objections to the exercise of governmental authority and the presidential transition, as well as other perceived grievances fueled by false narratives, could continue to mobilize to incite or commit violence.

Note: The expiration date for this bulletin has been extended to May 15, 2021

Effective: 2021-01-27 11:00 am. Expires: 2021-04-26 12:00 pm. *Alert Dates are Eastern Time*


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*


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*


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*


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*


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*


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*


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*


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*


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*


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*


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*


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.

  • Subscribe to NTAS Alerts via Email

    Subscribe to NTAS Alerts via email through GovDelivery.

  • Developer Resources

    NTAS resources for developers, including API documentation and the NTAS widget that can be added to any website.

Last Updated: 04/15/2022
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