"We have given them three days to take action... The principal employer here is the DLF and also the contractor who was hired for the job are responsible for negligence," NCSC Vice Chairman L Murugan told PTI.
Meanwhile, the NHRC issued notices to the Delhi chief secretary and the police commissioner, demanding a detailed report in the matter. It said the right to life of five innocent persons has been violated "due to negligence by the authorities and the contractor concerned".
"We would also like to know about the action taken against the authorities responsible in the matter along with measures taken for relief and rehabilitation of the kin of the deceased persons," the NHRC said in a statement.
The commission said it has been emphasising to the authorities that they should provide safety gear to workers to avoid fatal accidents.
The incident happened on Sunday in DLF Green Apartments in Moti Nagar.
According to police, Sarfaraz, Pankaj, Raja, Umesh and Vishal died after they inhaled toxic gases inside the tank.
A case has been registered, police said, adding that they are probing whose negligence was it that led to the incident.
"Minister of Labour has desired that a fact-finding inquiry is required to be conducted in the incident, so as to decide further course of action against defaulting agencies/firms by the government," Minister Rai's Secretary Vivek Kumar Tripathi said in a written communication to the police commissioner.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)