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According to 6 CFR 25.2 [Title 6 Homeland Security; Chapter I Department Of Homeland Security, Office Of The Secretary; Part 25 Regulations To Support Anti-Terrorism By Fostering Effective Technologies], the term "Act of Terrorism" means "any act determined to have met the following requirements or such other requirements as defined and specified by the Secretary:
(1) Is unlawful;
(2) Causes harm, including financial harm, to a person, property, or entity, in the United States, or in the case of a domestic United States air carrier or a United States-flag vessel (or a vessel based principally in the United States on which United States income tax is paid and whose insurance coverage is subject to regulation in the United States), in or outside the United States; and
(3) Uses or attempts to use instrumentalities, weapons or other methods designed or intended to cause mass destruction, injury or other loss to citizens or institutions of the United States."