The number of worldwide terror attacks fell to 10,283 last year, down from 11,641 in 2010 and the lowest since 2005, the State Department reported today.

What’s made the difference? The State Department cites the May 2011 killing of Osama bin Laden and other top al Qaeda members killed last year including Atiyah Abd al-Rahman and Anwar al-Awlaki, who was the head of Yemen’s Al Qaeda affiliate and had ties to the underwear bomber plot in 2010.

“The loss of bin Laden and these other key operatives puts the network on a path of decline that will be difficult to reverse,” the report stated.