; and (4) a summary of the report for public distribution. (c) Exception (1) In general The duty established under subsection (a) shall not apply in instances in which the Secretary of Homeland Security, the Attorney General, the Director of the Federal Bureau of Investigation, or the head of the National Counterterrorism Center determines that the information required to be reported could jeopardize an ongoing investigation or prosecution. (2) Notification requirement In each instance described in paragraph (1), the principal making a determination under such paragraph shall notify Congress of such determination not later than 1 year after the completion of the related investigation described in subsection (a). (d) Defined term In this section, the term act of terrorism means an act of domestic terrorism or international terrorism (as such terms are defined in section 2331 of title 18, United States Code).