An 18-month-old Arizona boy was killed on Tuesday after his 3-year-old brother accidentally shot him with a gun they found while visiting a family friend, KTVK-TV reported.

Authorities said the shooting happened around noon while the two children and their mother were visiting the friend, an unidentified 78-year-old man. The children, their mother and the man all lived in the same apartment complex in Payson, about 90 miles away from Phoenix.

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The Payson Roundup reported that Police Chief Don Engler said at a press conference Tuesday night that the older boy shot his younger sibling with a semi-automatic handgun he found in the apartment after they “slipped into another room unobserved by the mother.”

The childrens’ mother reportedly entered the room as the gun went off, hitting the younger boy in the head. The victim was pronounced dead at a local hospital.

Engler said the gun was not locked away at the time the children found it, and that no charges had been filed as of Tuesday evening. But, he said, authorities still planned to search the man’s apartment.

Watch KTVK’s report, as aired on Tuesday, below.

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[Image: “Little Boy Shooting A Toy Gun,” via Shutterstock]