A 10-year-old boy was shot dead by a security guard in Nizamabad, Ghaziabad area on Sunday. Police said that Ali was plucking mangoes with his friends when the guard shot him dead. His body was removed to mortuary for autopsy while the security guard was arrested by police. The accused told police that he gunned down the boy because he was plucking mangoes from trees in a garden. A case has been registered against the guard.