Gas leak from LPG cylinder kept under stairs led to explosion in a building that houses a sari dyeing unit in ground floor and apartments in three floors above. 30 minutes after the LPG explosion, another explosion occurred, said to be involving chemicals of the dyeing unit and caused collapse of the building. Two persons died in the incident. Four fire fighters involved in rescue operations were buried and rescued subsequently. The LPG cylinders belong to the adjacent marriage and convention hall, that also got damaged partially during the incident. Police and Fire Services asked for shifting of the mobile phone tower at the top of the marriage hall which developed cracks after the incident.
Case has been registered against owners of marriage hall and the residential building under provisions of section 337 (Causing hurt by act endangering life or personal safety of others), section 338 (Causing grievous hurt by act endangering life or personal safety of others), 304-A (Causing death by negligence) of the Indian Penal Code and also under the provision of The Explosive Substances Act.
http://www.dnaindia.com/bangalore/report_bangalore-cylinder-blast-crowds-please-learn-how-to-respond-to-tragedies_1590143
http://ibnlive.in.com/news/day-after-disaster-cops-scout-for-clues/186675-60-119.html
http://zeenews.india.com/news/karnataka/bangalore-building-collapses-after-cylinder-blast_732741.html