From the White House to Ground zero, Americans were out celebrating the killing of 9/11 mastermind Osama bin Laden on Monday.

In Washington D.C., masses of people huddled at Capitol Hill and in front of the White House. Some were singing the chorus of the Steam classic, Na Na Hey Hey Kiss Him Goodbye.

Bin Laden's demise is "huge," said Will Ditto, a 25-year-old legislative aide. "It's a great day to be an American."

Defense lobbyist Marlene English told the AP, "It's not over, but it's one battle that's been won, and it's a big one!"

In celebrations at New York flashpoints like Ground zero and Times Square, people waved flags and pictures of the World Trade Center towers taken down by the terrorist nearly 10 years ago. Signs seen in the crowd read, "Obama 1, Osama