Three persons sustained burn injuries as some unidentified miscreants hurled petrol bomb on a truck at Kansat area in Chapainawabganj on early Friday.
Two of the injured were being treated in Chapainawabganj while driver Jamadul Islam was taken to Rajshahi Medical College Hospital in a critical condition.
Duty doctor at Rajshahi Medical College Hospital Dr Atikur Rahman said Jamadul was suffering 30% burns to his body.