Osama bin Laden, the mastermind behind the Sept. 11, 2001, terror attacks that killed thousands of Americans, was slain Sunday in his luxury hideout in Pakistan in a firefight with U.S. forces, ending a manhunt that spanned a frustrating decade.

"Justice has been done," President Barack Obama declared late Sunday as crowds formed outside the White House to celebrate. Many sang "The Star-Spangled Banner" and "We Are the Champions."

Hundreds more waved American flags at ground zero in New York — where the twin towers that once stood as symbols of American economic power were brought down by bin Laden's hijackers 10 years ago.

Bin Laden, 54, was killed after a gunbattle with Navy SEALs and CIA paramilitary forces at a compound in the city of Abbottabad. He was shot in the left eye, NBC News' Savannah Guthrie reported citing an unnamed U.S. official.

In a background briefing with journalists, U.S. officials suggested that Bin Laden opened fire on the American forces before he was killed.

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I think I'm still in shock that this man is dead and buried.  It just seems so surreal. It's been nearly 10 years and I didn't think they'd ever capture him, let alone kill him.  I'm with the guy that was on CNN last night.  I think somebody 'dropped the dime' on Bin Laden's whereabouts.

I don't think people should be celebrating too early because the members of Al-Qaida could retaliate at any given time.  Thankfully, the US is on high alert, but we as a people need to do our part by keeping our eyes and ears open also.