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- Terrorism[remove]206
- National security201
- Prevention177
- Government policy54
- Intelligence service36
- IS (Organization)27
- United States. Department of Homeland Security22
- Religious aspects19
- Foreign relations18
- Islam17
- Qaida (Organization)17
- Law and legislation15
- Civil rights14
- Cyberterrorism14
- International cooperation14
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- Internal security12
- Jihad12
- Terrorists12