Article Photos: Indiana blast investigation focuses on natural gas 3/24

  A crowd gathers during a candlelight vigil, Sunday, Nov. 11, 2012, at Southwest Elementary School in Greenwood, Ind., for teacher Jennifer Longworth. Officials did not identify the two people who were killed in a blast on Saturday. However, a candlelight vigil was held for second-grade teacher Jennifer Longworth. She and her husband, John Dion Longworth, lived at a home destroyed in the blast. (AP Photo/The Indianapolis Star, Rob Goebel)