A 45-year-old woman died in the local hospital while the child succumbed to burns on way from Chandwa to a hospital in Ranchi, sources said.
A CRPF officer, who happened to be near the area, was among the injured.
All the injured, who sustained 50 per cent to 60 per cent burns, were referred to the Rajendra Institute of Medical Sciences in Ranchi.
Police suspect the blast occurred around 8 pm when the owner of the house, who allegedly used to sell gas illegally in retail, was filling the inflammable substance from one cylinder to another cylinder.
The blast destroyed a large portion of the house, police said.
Fire brigade personnel brought the fire under control after sometime.
