From the New York Times...

BIN LADEN DEAD, U.S. OFFICIAL SAYS [1]

Agence France-Presse — Getty Images

Osama bin Laden in Afghanistan in an undated photo.
Published: May 1, 2011

WASHINGTON--Osama bin Laden has  been killed, a United States official said Sunday night.

President Obama is  expected to make an announcement on Sunday night, almost ten years after the  September 11 attacks on the World Trade Center and the  Pentagon.
 

President Obama will deliver an unexpected statement as soon as 10:30 PM ET on Sunday evening.

A White House pool report says:

"Pool is informed that there is no longer a lid and that the president will make a statement as early as 10:30 p.m."

CNN's Steve Brusk tweets that "we are told it is a national security related announcement by the President."

Developing...