FILE - In this May 5, 1995 file photo, Karen Ellison of Oklahoma City looks through a chain link fence at the memorial service for rescue workers and volunteers at the Alfred P. Murrah Federal Building in Oklahoma City. More than 600 people were injured in the April 19, 1995 attack and 168 people were killed. Timothy McVeigh was executed in 2001 and Terry Nichols is serving multiple life sentences on federal and state convictions for their convictions in the bombing. (AP Photo J. Pat Carter, File)