New Delhi: In a fatal factory accident, four labourers were killed and nine others were severely affected on Thursday following the leakage of toxic gas at a toluene diisocyanate (TDI) plant in Gujarat.

The incident occurred at Gujarat Narmada Valley Fertilizer Limited Company (GNFC) located at Dahej in Bharuch.

 All the affected have been taken to a hospital for medical treatment.

Dahej police registered a complaint and started probe into the incident. All the employees have been evacuated from the factory.

This is the second time such incident happened in the same plant. A phosgene gas leakage incident in January 2014 left 21 labourers injured.