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The war on terror may have weakened terrorist networks, but it has failed to eliminate the threat of terrorism

The photo was taken of metropolitan New York City (and other parts of New York as well as New Jersey) on the morning of September 11, 2001.

The global manhunt for al-Qaida's No 3 leader had taken 18 months. But America's attempt to bring him to justice, in a legal sense, has taken much, much longer. Critics say it has become one of the war on terror's greatest failures.

The upcoming September 11 is the 20th anniversary of the terrorist attacks that drew the United States into war in Afghanistan.