Flames engulfed the unit and thick, black smoke billowed into the air from its premises. (Photo: Twitter | ANI)

Hyderabad: Four workers suffered minor injuries in a fire which broke out in a pharma unit at Hyderabad on Friday morning, police said.

The fire broke out between 6:30 am and 7 am in the pharma unit located in the Jeedimetla area, a police official told news agency PTI.

"Four people (all workers) suffered minor burn injuries," he said.

Flames engulfed the unit and thick, black smoke billowed into the air from its premises, the official said.

Half a dozen fire engines were rushed to the spot and the blaze has been brought under control, he said.

Fire breaks out in a chemical factory in the Jeedimetla industrial area of Hyderabad (Photo: Twitter | ANI)

An operation is on to find if anyone is still trapped inside the premises, the official said.

The exact cause of the fire was not yet known, he added.

Meanwhile, the Industrial inspector has informed that 20 members were on duty when the fire took place.

He added that the main reason for the fire is due to an explosion in the reactor.

"We expect that the fire will be controlled in some time, as of now five workers who were stuck inside in the chemical company have been rescued," said Assistant District Fire Officer GV Prasad.

The Jeedimetla industrial area is home to hundreds of small scale industries, and larger chemical and pharmaceutical industries. Therefore, fire officials were concerned about the spread of fire.