Terrorism and Intentional Attacks

Terrorism and intentional attacks involve acts of violence or sabotage designed to create fear, cause mass casualties, disrupt infrastructure, or influence political or social outcomes. These attacks may be carried out by individuals (lone actors), organized groups, or foreign/state-sponsored actors. Common targets include crowded public spaces, transportation systems, government buildings, and critical infrastructure.

Forms of attack may include:

  • Bombings or shootings
  • Biological, chemical, or radiological release
  • Cyberterrorism targeting infrastructure or financial systems
  • Vehicular attacks or arson
  • Coordinated multi-site assaults

Common Indicators of Suspicious Activity

  • Unattended bags or packages in public places
  • Individuals recording or mapping security features or access points
  • Unusual behavior or clothing inconsistent with the environment
  • Attempts to access restricted areas
  • Vehicles parked in unusual locations for long durations

“If you see something, say something” – contact authorities immediately.

Preparedness Tips

For individuals

  • Know your surroundings at all times
  • Identify two exits at any public venue
  • Have a family emergency contact plan in place
  • Carry ID, a basic first aid kit, and a small flashlight
  • Avoid discussing travel or personal routines online

For businesses and public spaces

  • Conduct security audits and staff training
  • Establish emergency lockdown and evacuation procedures
  • Implement access controls and surveillance where appropriate
  • Coordinate with local law enforcement or DHS Fusion Centers

During an Attack

If you hear gunfire or explosions:

  • RUN – Escape if there’s a clear path
  • HIDE – Shelter in place out of view and silence devices
  • FIGHT – As a last resort, use any object to defend yourself

If caught in a chemical or radiological event:

  • Get indoors, seal windows and doors, turn off ventilation
  • Remove contaminated clothing and wash skin with soap and water
  • Wait for instructions via radio or emergency alerts

If you witness an attack:

  • Do not post footage or rumors—this may aid attackers or hinder responders
  • Provide accurate information to authorities
  • Remain calm and assist others if safe to do so

After an Attack

  • Cooperate fully with first responders and investigations
  • Seek medical attention for physical or emotional trauma
  • Document your account for officials, but avoid sharing online speculation
  • Report hate crimes or retaliatory threats—secondary violence can occur

Mental Health Support

Terrorist events can have long-lasting emotional effects, even for those not physically injured. Seek professional counseling for:

  • Anxiety, fear of public places
  • Insomnia or flashbacks
  • Depression or anger
  • Survivor’s guilt

Key Resources

Recommended Apps

  • FEMA App – Warnings and safe zones during major incidents
    fema.gov/mobile-app
  • PulsePoint – CPR alerts and incident response coordination
    pulsepoint.org
  • See Say App (Amtrak / DHS) – Report suspicious behavior anonymously
    seesay.org