U.S. marks 19th anniversary of Sept. 11 attacks(27 images)

Ceremonies in New York City, Pennsylvania and Washington, D.C., mark the 19th anniversary of the Sept. 11, 2001 terrorist attacks. Nearly 3,000 people were killed when terrorists hijacked four airliners and crashed them in the deadliest terrorist strikes ever on U.S. soil.

A mourner wearing an American Flag face mask leans in to kiss an engraved name at a 9/11 Memorial Reflecting Pool in Lower Manhattan near One World Trade Center on Friday. Photo by John Angelillo/UPI | License Photo
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