Seven children were injured on Saturday when a bomb they found in a field in Bihar's Bhagalpur district accidentally exploded, police said.The incident took place in Kathalbari in Bhagalpur, about 200 km from Patna."Some children, who were playing in the field, found a bomb. As they were not aware it was a bomb, they hit it with a brick that resulted in the explosion and injured seven of them," Brari police station officer-in-charge K.K. Akela said.All the injured children were admitted to a hospital for treatment.