The incident took place around 6 PM yesterday when the victim, identied as Ayan, was playing marbles outside his residence when one of them slipped from his hands and rolled its way close to the rear side of an air-cooler, police said.
When Ayan tried to squeeze through a narrow opening to fetch the marble, he came into contact with the cooler and was electrocuted. His grandmother raised an alarm, following which the boy was rushed to a hospital where doctors declared him dead, police said.
"We have registered a case under Sections 287 (negligent conduct with respect to machinery) and 304A (causing death by negligence) of IPC against unknown persons in connection with the incident," DCP (Northeast) A K Singla said.