The fire, which was allegedly caused by a gas leakage, triggered an explosion, after which the neighbours called in the fire brigade who put out the blaze, according to witnesses.
The injured, including the 14-year-old brother of the girl, have been admitted to hospital, where their condition is said to be serious.
Meanwhile, police has arrested five people from Pengu village of Bah tehsil here for allegedly killing one Anand Kumar and throwing his body into a well.
Anand allegedly had a long-pending dispute with Ram Snaehi and four others over non-payment of dues.