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(CNN) -- Some key dates surrounding the terrorism issue:
February 26, 1993: A truck bomb explodes in the parking garage of the World Trade Center, killing six people.
August 7, 1998: The U.S. embassies in Kenya and Tanzania are attacked with truck bombs.
October 12, 2000: The U.S.S. Cole is attacked while refueling in Yemen.
September 11, 2001: Terrorists fly hijacked passenger planes into the World Trade Center and the Pentagon in a coordinated attack against the United States. A fourth hijacked plane crashes in a Pennsylvania field.
October 7, 2001: The U.S. launches military strikes against the Taliban in Afghanistan.
October 26, 2001: President Bush signs the Patriot Act.
October 12, 2002: More than 200 people, mostly tourists, are killed when bombs explode in two popular nightclubs on the Indonesian resort island of Bali.
May 1, 2003: Defense Secretary Donald Rumsfeld and Afghan President Hamid Karzai declare the end of major combat operations in Afghanistan.
August-September 2003: Taliban rebels renew fighting in southern and eastern Afghanistan
March 11, 2004: Terrorists bomb four commuter trains in Madrid, Spain, killing 191 people.
July 7, 2005: Three subway trains and a double-decker bus are bombed in London, England, during morning rush hour, killing 56 people.
March 16, 2006: The United Arab Emirates-based firm DP World announces it will sell control of six U.S. shipping ports to an American buyer after members of Congress raised concerns over domestic security.
March 9, 2006: President Bush signs the re-authorization of the Patriot Act.
July 11, 2006: Seven bombs explode on commuter trains in Mumbai, India, killing 186 people.
August 2006: Afghanistan's southern provinces bear the brunt of the worst bout of violence since U.S.-led forces toppled the hard-line Taliban regime in late 2001.
August 10, 2006: British authorities uncover a plot to detonate bombs on planes bound for the U.S. from Great Britain.
August 17, 2006: A U.S. District Court judge rules that the government's warrantless wiretapping program is unconstitutional. The Justice Department says it will appeal the decision.
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