Though the authorities are yet to figure out what caused the deadly fire at Sachinam Heights in Tardeo last month, they now know how it spread from the first floor to the 20th. According to a report submitted by the investigating committee, the flames spread through the electrical duct and reached the floors wherever the duct doors were open.

The metal doors weren’t properly closed because the cable and internet wires were poking out. On top of that, the duct had many flammable articles, like cricket bats, stumps, wooden plates, jute ropes and wheelchairs, states the report. The doors to the terrace were locked, which blocked the smoke plume.