Federal agents investigate an apparent bomb explosion at the Social Security Administration office on Marshall Street in downtown Casa Grande, Ariz. on Friday, Nov. 30, 2012. No one was

 

              Federal agents investigate an apparent bomb explosion at the Social Security Administration office on Marshall Street in downtown Casa Grande, Ariz. on Friday, Nov. 30, 2012. No one was
Federal agents investigate an apparent bomb explosion at the Social Security Administration office on Marshall Street in downtown Casa Grande, Ariz. on Friday, Nov. 30, 2012. No one was hurt in the explosion. (AP Photo/Casa Grande Dispatch, Oscar Perez)