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Gary Hershorn / Reuters
The Tribute in Light is illuminated on the skyline of New York during events marking the 11th anniversary of the 9/11 attacks on the World Trade Center as people watch from Liberty State Park in Jersey City, New Jersey, September 11, 2012. Continue reading the full story.
See more PhotoBlog posts on 9/11
Ceremonies at World Trade Center, the Pentagon, and Shanksville, Pa. mark 11 years since the attacks.
Thousands gathered Tuesday in New York, suburban Washington and rural Pennsylvania to mark the 11th anniversary of the Sept. 11 attacks. NBC's Ron Allen reports.