By mid-February, intelligence from multiple sources was clear enough that Obama wanted to "pursue an aggressive course of action," a senior administration official said. Over the next two and a half months, the president led five meetings of the National Security Council focused solely on whether bin Laden was in that compound and, if so, how to get him, the official said.
Obama made a decision to launch the operation on Friday, shortly before flying to Alabama to inspect tornado damage, and aides set to work on the details.
The president spent part of his Sunday on the golf course, but cut his round short to return to the White House for a meeting where he and top national security aides reviewed final preparations for the raid.
Two hours later, Obama was told that bin Laden had been tentatively identified.
CIA director Leon Panetta was directly in charge of the military team during the operation, according to one official, and when he and his aides received word at agency headquarters that bin Laden had been killed, cheers broke out around the conference room table.
Administration aides said the operation was so secretive that no foreign officials were informed in advance, and only a small circle inside the U.S. government was aware of what was unfolding half a world away.
In his announcement, Obama said he had called Pakistani President Zardari after the raid, and said it was "important to note that our counter-terrorism cooperation with Pakistan helped lead us to bin Laden and the compound where he was hiding."
One senior administration told reporters, though, "we were very concerned ... that he was inside Pakistan, but this is something we're going to continue to work with the Pakistani government on."
The compound is about 100 yards from a Pakistani military academy, in a city that is home to three army regiments and thousands of military personnel. Abbottabad is surrounded by hills and with mountains in the distance.
Critics have long accused elements of Pakistan's security establishment of protecting bin Laden, though Islamabad has always denied it, and in a statement the foreign ministry said his death showed the country's resolve in the battle against terrorism.
Whatever the global repercussions, bin Laden's death marked the end to a manhunt that consumed most of a decade that began in the grim hours after bin Laden's hijackers flew planes into the World Trade Center twin towers in Manhattan and the Pentagon across the Potomac River from Washington. A fourth plane was commandeered by passengers who overcame the hijackers and forced the plane to crash in the Pennsylvania countryside.
In all, nearly 3,000 were killed in the worst terror attacks on American soil.
Former President George W. Bush, who was in office on the day of the attacks, issued a written statement hailing bin Laden's death as a momentous achievement. "The fight against terror goes on, but tonight America has sent an unmistakable message: No matter how long it takes, justice will be done," he said.
Copyright 2011 The Associated Press.
Video: Pakistan aided U.S. in operation
Video: Crowds cheer outside White House