The death of two people at Indian pharmaceutical firm Dr. Reddy's Laboratories' plant, which the police say was caused by gas leakage, has not impacted production at the unit, the drug maker said.

An employee and a contract worker died in the incident that occurred at the company's plant in the southern state of Andhra Pradesh. Dr Reddy's company said no one else was injured in the incident.

The police are investigating the incident that occurred around midnight on Tuesday and have booked a case of negligence but have made no arrests so far, A.S.K. Das, a senior police officer, told Reuters.

The plant is approved by the U.S. Food and Drug Administration and makes bulk drugs, a company official said.