Cease-fire in Syria gets shakier.

Last Sunday, the United States remembered the Sept. 11, 2001, terror attacks, the deadliest on American soil. The attacks killed nearly 3,000 people in New York, Washington, D.C., and Shanksville, Pa. A decade and a half later, the country is still traumatized — and has changed forever. The anniversary was remembered across the nation, highlighted by ceremonies in New York, a wreath-laying at the Pentagon and commemorations by troops in Afghanistan.

The Tribute in Light rises above the lower Manhattan skyline where the twin towers of the World Trade Center once stood. Last Sunday marked the 15th anniversary of 9/11, the deadliest terrorist attacks on U.S. soil.