President Obama Announces Bin Laden Is Dead

President Barack Obama addressed the nation just after 11:30 p.m. Sunday to announce that U.S. troops killed Osama bin Laden in Pakistan and took his body.

Obama said he received a tip in August, and that the operation he initiated was the result of months of investigation. 

Obama spoke about the devastating images of Sept. 11, 2001, that killed "nearly 3,000 citizens." The most painful are the private ones, he said, the "empty seat at the dinner table."

"His demise should be welcomed by all who believe in peace and human dignity," Obama said. 

U.S. forces killed the al Qaeda leader in a firefight, he said, and no U.S. troops were injured. 

People gathered outside of the White House and Ground Zero cheering and singing patriotic songs after the news of bin Laden's death. 

"Justice has been done," Obama said. 

For more, follow CNN's coverage.