The dramatic drop in violence in Iraq is due in large part to a secret program the U.S. military has used to kill terrorists, according to a new book by Pulitzer Prize-winning journalist Bob Woodward.
The program -- which Woodward compares to the World War II era Manhattan Project that developed the atomic bomb -- must remain secret for now or it would "get people killed," Woodward said Monday on CNN's Larry King Live.
"It is a wonderful example of American ingenuity solving a problem in war, as we often have," Woodward said.
In "The War Within: Secret White House History 2006-2008," Woodward disclosed the existence of secret operational capabilities developed by the military to locate, target and kill leaders of al Qaeda in Iraq and other insurgent leaders.
National security adviser Stephen Hadley, in a written statement reacting to Woodward's book, acknowledged the new strategy. Yet he disputed Woodward's conclusion that the "surge" of 30,000 U.S. troops into Iraq was not the primary reason for the decline in violent attacks.