Five boys were injured on Monday when a bomb among six they found in a bag exploded at Laskari village.
The boys who were playing found the explosives in the bag in a paddy field in the village. One of the bombs exploded when one of the boys threw a stone at it, Sub-Divisional Police Officer Avinash Kumar told reporters in Hazaribagh.
The boys, aged around 16 years, were admitted to the Hazaribagh Sadar hospital.
The SDPO said that the bombs belonged to criminals and said it was not related to the polls.