In the past 48 hours, the United States has been alerted to several significant terrorist threats, highlighting the ongoing and evolving nature of security risks within the country.
On March 18, 2025, the American Hospital Association (AHA) and the Health Information Sharing and Analysis Center (Health-ISAC) issued a joint threat bulletin warning U.S. hospitals about a potential coordinated multi-city terrorist attack. The alert was triggered by a social media post suggesting that ISIS-K, a division of the Islamic State, is planning advanced-stage attacks on hospitals across multiple mid-tier U.S. cities. These attacks are reportedly to involve Vehicle-Borne Improvised Explosive Devices (VBIEDs) followed by armed assaults and hostage scenarios. The AHA and Health-ISAC, although unable to corroborate or discount the credibility of the threat, have advised hospital security teams to review their emergency management plans, raise staff awareness, and remain vigilant for suspicious activity. This warning underscores the vulnerability of critical infrastructure, such as hospitals, which are often viewed as soft targets by terrorist groups[4].
This alert comes against the backdrop of a broader terrorist threat landscape outlined in the Homeland Threat Assessment 2025 by the U.S. Department of Homeland Security. The assessment indicates that the terrorism threat environment in the United States will remain high over the next year, driven by factors such as violent extremist responses to domestic sociopolitical developments, the enduring intent of Foreign Terrorist Organizations (FTOs) to conduct or inspire attacks, and the galvanizing effect of successful terrorist attacks abroad. Specifically, the ongoing Israel-HAMAS conflict and the upcoming 2024 U.S. election cycle are expected to exacerbate these threats. Domestic violent extremists (DVEs), motivated by various ideologies including anti-government, racial, and gender-related grievances, are also expected to continue posing a significant threat[2].
Additionally, the assessment highlights that DVEs and other criminal actors are likely to target U.S. critical infrastructure, including government buildings and foreign embassies, in response to flashpoint events. The recent terrorist attack by HAMAS against Israel and subsequent Israeli operations in Gaza have prompted renewed calls from groups like al-Qa‘ida and ISIS for lone offender attacks against such targets[2].
These threats are further complicated by the evolving nature of terrorist financing and the use of social media for radicalization. The 2024 National Terrorist Financing Risk Assessment notes that individuals inspired by AQ, ISIS, or DVE ideologies can be radicalized online and carry out deadly attacks with limited warning, posing a significant challenge to U.S. security[3].
In response to these threats, the National Terrorism Advisory System (NTAS) continues to play a crucial role in communicating timely and detailed information to the American public. The system, which replaced the color-coded alerts of the Homeland Security Advisory System in 2011, ensures that all Americans are aware of the heightened risk of terrorist attacks and know what actions to take[1].
As the U.S. remains vigilant against these threats, the coordination between federal agencies, local law enforcement, and critical infrastructure sectors such as healthcare is crucial for mitigating potential attacks and ensuring public safety.
