The incident took place on Tuesday morning when Sushila's eldest daughter Mehak was cooking food for her mother and three siblings, who were asleep.
The incident occurred around 11.34 am at building number 148 of the Kasturba Hospital in Mumbai's Chinchpokli area.
The team is mandated to review different systems including safety mechanism, fire and gas control mechanism and environmental management aspects.
Based on a preliminary investigation, authorities said methyl formate leaked from a van while company workers were unloading chemicals from it.
An official said that the incident took place late on Thursday night and the leakage was plugged within an hour.
Immediately after the incident, management of the factory shifted the workers to a hospital in Nellore and three of them died while undergoing treatment.
The grim scenes in the wee hours of the LG Polymers gas leak still haunt the residents of Venkatapuram village, located in Pendurthi mandal in Visakhapatnam district of Andhra Pradesh.