Three people were burnt in a gas cylinder explosion at a house in Fatullah of Naraynganj around 11:30pm on Saturday.
The burn injured are Mohammad Alam, 35, Md Romjan Ali, 22 and Md Sifat, 12, all hailed from Cumilla.
They were admitted to Sheikh Hasina National Institute of Burn and Plastic Surgery (SHNIBPS).
Sumon, who brought them to the hospital, said the blast occurred while they were cooking at night.
Md Tariqul Islam, Resident Physician of the SHNIBPS, said Alam suffered 72% burn injuries, Ali 58% and Sifat 28%. They all are in critical condition.