A 7-year-old boy was hacked to death for plucking mango at an orchard at Balapukur village at Saptibari union in Aditmari upazila on Sunday night. The boy, Dulal Hossain, was son of Abdul Gani Mia of the village. Police and locals said, Zahir Uddin, 15, son of Farid Uddin picked up a quarrel with his neighbour Dulal over plucking mango on Sunday evening. Later Zahir along with his friends caught Dulal and took him to a maize field on the bank of a canal. There they killed Dulal with sharp weapons and dumped the body on the spot. Police arrested Zahir on Monday.