Rika Apriant, spokesperson for the Prisons Department of the Indonesian Ministry of Law and Human Rights, said in a statement that 39 detainees were injured in the blaze that broke out in Block C, where prisoners convicted of drug-related offenses.
Hundreds of soldiers and police were dispatched to take control of the prison, while the fire, which broke out between 1 a.m. and 2 a.m. local time, was completely extinguished.
The cause of the fire is not yet known.
Riots and escapes are common in Indonesian prisons, where the capacity is greater than that of inmates. Tangerang prison, where the fire took place, has a capacity of 1,225 people according to official statistics, but around 2,000 prisoners are held there.