Article Photos: Oklahoma City tree planting remembers 9/11, Murrah Building bombing 31/33

People bow their heads during the invocation. An estimated crowd of 2,000  attended the  Remembrance Ceremony to mark  the 17th anniversary of the 1995 bombing of the Alfred P. Murrah Federal Building in downtown Oklahoma City in which 168 people were killed.  Photo taken April 19, 2012.        Photo by Jim Beckel, The Oklahoman