Three staffers of Anglo-French Drugs & Industries Ltd sustained severe burns when a fire broke out in the lab in Peenya Industrial Area on Tuesday.
Six fire tenders were pressed into service and after an operation that lasted for more than three hours, the fire was doused.
Two of the injured, Manjunath and Abishek, have been hospitalised. The third person is yet to be identified.
Fire department officials said the fire broke out around 2.50 pm on the first floor of the two-storey building on AVB Road. Security guard Timmarayappa noticed smoke billowing out from the lab and alerted the fire force but the fire spread to other parts of the building.
More than 80 people on the ground floor did not notice or hear the fire as some parts of the building was sound-proof. They were alerted by people outside the building. Manjunath and Abhishek were rescued before fire fighters reached the spot. Chemicals and other drugs used to manufacture medicines were destroyed in the fire.
A senior officer from the fire department said the building neither had fire-fighting equipment nor a No-Objection Certificate from the department. The cause of the fire and losses are yet to be ascertained, Peenya police said.