Indiana blast investigation focuses on natural gas - Article Photos 11/24

A memorial is set up outside Southwest Elementary school in Greenwood, Ind., Monday Nov. 12, 2012 for victims of the explsion in Indianapolis. The coroner's office had not yet identified the two people killed in the blast, but a candlelight vigil was held Sunday at the school where Jennifer Longworth teaches. (AP Photo/The Daily Journal,Scott Roberson)