At least seven workers died and dozens were hospitalised after a suspected ammonia gas leak at a seafood export processing facility near Periyapalayam in Tamil Nadu's Tiruvallur district on Sunday, 21 June, according to officials. The leak, which originated from the unit's refrigeration or processing system, rapidly spread through parts of the facility, triggering a mass medical emergency.

How the Incident Unfolded

The leak was reported at a private seafood processing and export unit in Kannigaipair village, Tiruvallur, where a large number of migrant workers — many of whom reside within the premises — were on duty. Approximately 120 workers, including women from Assam, Odisha, and Jharkhand, were reportedly present when the gas began to spread.

Workers exposed to the ammonia started experiencing severe breathing difficulties, dizziness, and irritation. Some reportedly suffered bleeding from the mouth and nose, indicating the intensity of exposure. Panic spread through the premises as workers rushed out while others collapsed after inhaling the toxic gas.

Casualty and Medical Update

According to government figures, 64 workers — including 60 women and four men — were affected. Police sources had initially confirmed one fatality; the toll climbed to seven as rescue and treatment efforts continued. As of the latest update, 15 workers remain under intensive monitoring at a government hospital, 23 are admitted to the intensive care unit of a private hospital, and 24 others are under observation at a separate private medical facility. Doctors treating the victims said many had suffered serious respiratory complications and are being closely monitored.

What the Government Said

Tamil Nadu Chief Minister C. Joseph Vijay announced a compensation of ₹2 lakh each for the families of the seven deceased workers. He directed officials to disburse the amount from the Chief Minister's Public Relief Fund and ordered that the bodies of the deceased be transported to their native states at government expense. The Chief Minister also directed authorities to ensure the best possible treatment for the injured and instructed that compensation and benefits available under the Employees' State Insurance (ESI) scheme or the Employees' Compensation Act be facilitated without delay.

Inquiry Committee and Safety Audit

Chief Minister Vijay ordered the constitution of a three-member inquiry committee to investigate the circumstances that led to the leak. The panel has been instructed to conduct an immediate inspection and submit a detailed report within 24 hours. The investigation is expected to examine safety protocols, maintenance procedures, and possible lapses at the facility. Police have registered a case, and further investigations are underway.

In the aftermath, the Tamil Nadu government has ordered inspections of hazardous industries across the state to verify compliance with safety regulations. The tragedy has renewed concerns over workplace safety standards and the welfare of migrant workers employed in high-risk industrial settings — a vulnerability that labour rights advocates have flagged repeatedly in recent years.