The fire that started on the second floor of the building has now spread to the fifth floor.
A major fire broke out in the Teaching Block of the All India Institute of Medical Science (AIIMS) in Delhi on Saturday and firemen are battling to douse the blaze.
No casualty has been reported in the incident.
While sources earlier said the fire has been brought under control, flames were still seen from outside the building.
The fire that first started on the second floor of the building has now spread to the fifth floor.
ANI reported that a total of 34 fire tenders were pressed into service and firefighters were able to contain the fire from spreading to nearby blocks.
In a statement, AIIMs said Delhi Fire Services along with AIIMS fire division have controlled the fire and are still on the job.
There was a fire in the Teaching Block at AIIMS around 5:00 pm today, India's premier hospital and medical college said, adding that there has been no loss or damage to life.
"As a precautionary measure, the patients admitted in adjoining AB Wing have been shifted out to the other wings of the hospital temporarily. The situation is being monitored closely by Union Health Minister Dr Harsh Vardhan," it said.
In a tweet, Dr Harsh Vardhan said he was personally monitoring the situation.
"The at AIIMS is sad but it is a matter of satisfaction that due to the alertness of the hospital administration, the fire was controlled in time. I am personally monitoring the matter. Patients have been shifted to other wards," he said.
The minister also shared a helpline number - 011-26593308 - for those looking for more details.
The fire, which broke out late afternoon in the hospital, caused extensive damages to the first, second and third floor of the PC Block.
However, as a precautionary measure, patients and other occupants from the AB 1 to AB 7 wards were evacuated to Rajendra Prasad Centre for Ophthalmic Sciences and other safe areas.
The PC Block is a non-patient block comprising of research labs, doctors rooms etc, however, it is interconnected to the Emergency Wing of the hospital.
A short circuit is suspected to have caused the blaze.
Delhi Chief Minister Arvind Kejriwal expressed the hope that the fire would quickly be brought under control and urged the people to remain calm.
"The fire in AIIMS building will be brought under control at the earliest. Fire service trying its best to extinguish the fire. I appeal to everyone to maintain calm and allow the Fire Services personnel to do their work," Kejriwal's posted on his twitter handle.
According to an AIIMS official, a total of 15,000 new patients visit the hospital, out of which almost one-third visit the Emergency wing.
(With ANI inputs)
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