Update at 1:17 a.m. ET, May 2. Crowds Gather At Ground Zero:

"Hundreds of people were gathering in New York City at the World Trade Center site, where the twin towers fell on Sept. 11 nearly 10 years ago, hours after President Barack Obama announced that Osama bin Laden was killed," The Associated Press reports. "Many were waving American flags or taking pictures early Monday. The group broke into spontaneous, jubilant cheers and song, including a rendition of I'm Proud to be an American."