A police officer secures the street in front of a mall following a blast in Athens, Sunday, Jan. 20 2013. A bomb exploded Sunday at a shopping mall in Athens, slightly wounding two secu

A police officer secures the street in front of a mall following a blast in Athens, Sunday, Jan. 20 2013. A bomb exploded Sunday at a shopping mall in Athens, slightly wounding two security guards, police said. (AP Photo/Kostas Tsironis)