They were admitted to Sheikh Hasina National Institute of Burn and Plastic Surgery with burn injuries.
Of them, 10 were identified, said Inspector Bachchu Mia, in-charge of Dhaka Medical College Hospital police outpost, reports BSS.
They were Md Akash, Md Kuti, Md Ariful, Maidul Islam, Yasin, Soleiman, Noor Nabi, Moshammat Shilpi, Mohammad Naeem and Nirab.
A cooking gas cylinder exploded at a colony next to Top Star Garment Factory around 6:00pm today, said Gazipur Fire Service and Civil Defence Deputy Director Abdullah Al Arefin.
Locals said a cooking gas cylinder started leaking at a house in the colony. The resident brought the cylinder to the main door and threw it out on the road, leading to the explosion.
A fire engine is working at the scene.