Police say they're now investigating a deadly house explosion on the southeast side of Indianapolis the night of November 10 as a homicide. ABC News reports authorities are searching for two men spotted in a white van on the day of the explosion. An elementary school teacher and her husband were killed. Police announced the homicide investigation just hours after funeral services were held for John and Jennifer Longworth. The couple lived next door to Monsy Shirley's home, which exploded on November 10th, leveling the Longworth home and damaging 86 others. Authorities say Shirley and her family were not home at the time of the blast.