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- For the telephone hotline, see 9-1-1.
The attacks resulted in a number of expansions of the U.S. government's counter-terrorist capabilities. In general, 9/11 strengthened the often-contentious relationship between the Central Intelligence Agency and FBI. The FBI instituted a formal alert system to notify all agencies under Homeland Security of potential threats. In addition, a number of the Counter Terrorist Unit's past missions were declassified for the first time. 9/11 precipitated the passage of the Patriot Act. (Operation Hell Gate, Veto Power, Head Shot)