Abdul Hannan, in-charge of the camp, said the fire broke out at a house in the camp under E-block around 3 am and spread soon.
The fire spread fast as most of the residents use gas cylinders in the camp for cooking, he said.
On information, a fire fighting unit rushed in and extinguished the blaze with the help of Rohingya people.
Around 20 people sustained injuries in the fire that also burnt down 432 houses, one Community center of UNHCR, and two dwelling houses of local people.
However, the origin of the fire could not be known immediately.
Refugee Relief and Repatriation Commissioner (RRRC) Shah Rezwan Hayat visited the spot.