Two persons standing in front of gas piping during cleaning were hit by cleaning device at high pressure, hit the compound wall and died. There was no fire or explosion. Only mechanical impact caused the incident.
http://indianexpress.com/article/india/india-others/two-killed-in-accident-at-gails-lpg-pipeline-in-telangana/
The reason reported was nonisolation of pressurized gas supply to the pipeline, though it was assured (?). On any energized system, before working, one should do positive isolation and vent and flush the system, which seems to be not done in this case. Assurances alone will not help.
http://www.thehansindia.com/posts/index/2015-04-05/Negligence-behind-the-mishap-in-GAIL-gas-leak--142181