Two persons in Chitwan have sustained injuries after a bomb hidden in a tree hollow exploded while chopping the tree on Thursday afternoon. The injured have been identified as 25-year-old Prem Bahadur Praja and his 9-year-old son Sujan. Police said Prem is in critical condition and his son has sustained minor injuries. The incident took place near the Sisneri-based Damar jungle while Prem was chopping the tree. All of a sudden, the bomb which was hidden in the hollow of the tree exploded injuring both father and son. Praja’s left palm was damaged and he sustained deep wounds in various other parts of the body, said police. Locals carried the injured man on foot for three hours to the nearest road and reached a Bharatpur-based hospital in the evening for treatment, said police. The family is planning to take Sujan to treatment tomorrow. Chitwan District Police Office SP Basanta Bahadur Kunwar said a police team would be deployed on Friday to the incident site.