Mumbai: At least two labourers died after they fell into a 40-feet deep septic tank of an under-construction building in Malad area of Mumbai on Wednesday while another worker was rescued in a critical condition, officials said.

The incident occurred at around 3:50 PM, and as per the preliminary information, at least 3 to 4 people fell into the underground septic tank.

"Mumbai Fire Brigade officials rescued three stranded labourers and sent them to Jogeshwari-based Trauma Care Hospital, where doctors declared two of them 'brought' dead," a civic official said.

He said the condition of another labourer rescued from the spot was critical.