People gather during memorial observances on the 13th anniversary of the Sept. 11 terror attacks on the World Trade Center in front of 1 World Trade Center in New York, Thursday, Sept. 11, 2014. Family and friends of those who died read the names of the nearly 3,000 people killed in New York, at the Pentagon and near Shanksville, Pennsylvania.

New terror fight casts shadow over 9/11 ceremonies

The United States is remembering the victims of the Sept. 11, 2001 terror attacks.