Protecting the American people from terrorist threats is the founding purpose of the Department and our highest priority. The Department's efforts to battle terrorism, include detecting explosives in public spaces and transportation networks, helping protect critical infrastructure and cyber networks from attack, detecting agents of biological warfare, and building information-sharing partnerships with state and local law enforcement that can enable law enforcement to mitigate threats.
Learn more about recent counterterrorism efforts
"If You See Something, Say Something™"
If you see suspicious activity, please report it to your local police department. If you are experiencing an emergency, please call 911. More on the "If You See Something, Say Something™" campaign.
Report suspected immigration or customs violations:
Report cybersecurity activity to US-CERT:
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