The incident took place on October 22 at about 16:00. 

"According to preliminary data ... while in the inpatient department, the child was wounded in the head from a traumatic weapon belonging to his grandfather, born in 1955, who accompanied the victim during the hospitalization period," the UK said.

A case was initiated on the fact of causing grievous harm to the health of a minor.

Investigators establish a complete picture of what happened.

Including the version that the minor injured himself as a result of careless handling of the weapon is being considered.

The Investigative Committee also finds out the circumstances of the finding in the medical department of the weapon, the legality of its acquisition and carrying.