Ronald Reagan died on June 5, 2004, in Los Angeles, California, from complications of Alzheimer's disease. A state funeral occurred in Washington, D.C., and Simi Valley, California, where Reagan was interred at the Ronald Reagan Presidential Library. 200,000 mourners (5,000 per hour) filed past Reagan's casket in the Capitol rotunda June 9–11, 2004. Over two dozen world leaders listened to eulogies given by President George W. Bush, former Canadian Prime Minister Brian Mulroney and former British Prime Minister Margaret Thatcher during a national funeral service held at Washington National Cathedral. This funeral also featured a new element: a massive security operation. The state funeral marked the first time that Washington hosted a major event since the September 11, 2001 attacks. As a result, the Department of Homeland Security (DHS) designated the state funeral a National Special Security Event (NSSE), making the United States Secret Service in charge of security. Attorney General John Ashcroft told a Senate hearing before the funeral: "It is a sad commentary when the observation of a memorial service for a former president of the United States must be labeled a National Special Security Event. Such is the fact of modern life in Washington and such is the nature of the war against al Qaeda."