August 7, 2017: Volunteers clear some mementos from the chain link fence along the Oklahoma City National Memorial, site of the April 19, 1995 bombing of the Alfred P. Murrah Federal Building in Oklahoma City, Oklahoma. Older mementos that have begun to rust are removed regularly and preserved in the museum's archive.

August 7, 2017: A general view shows the reflecting pool and field of empty chairs at the Oklahoma City National Memorial, site of the April 19, 1995 bombing of the Alfred P. Murrah Federal Building in Oklahoma City, Oklahoma. The pool occupies what was once N.W. Fifth Street.

August 7, 2017: A general view shows the Oklahoma City National Memorial Museum (left) which is attached to the former Journal Record newspaper building near the site of the April 19, 1995 bombing of the Alfred P. Murrah Federal Building in Oklahoma City, Oklahoma.

August 7, 2017: Visitors roam the Field of Empty Chairs at the Oklahoma City National Memorial, site of the April 19, 1995 bombing of the Alfred P. Murrah Federal Building in Oklahoma City, Oklahoma. The Field of Empty Chairs sits on the footprint of the Alfred P. Murrah Federal Building and is a tribute to the 168 people who lost their lives in the bombing. The chairs stand in nine rows to represent each floor of the building and each chair bears the name of someone killed on that floor. Nineteen smaller chairs stand for the children who were killed.

August 7, 2017: A single leaf lies on the freshly mown grass of the Rescuers' Orchard at the Oklahoma City National Memorial Museum, site of the April 19, 1995 bombing of the Alfred P. Murrah Federal Building in Oklahoma City, Oklahoma.