Police in Cleveland, Ohio, say a 3-year-old boy picked up an unattended gun inside a home and it went off, shooting a 1-year-old boy in the head and killing him.

Cleveland Police Chief Calvin Williams told reporters gathered outside the home after the shooting Sunday afternoon investigators are trying to determine where the gun came from.

Cleveland.com (http://bit.ly/1I5oHQ6 ) reports the 1-year-old was taken to a hospital and pronounced dead.

Full details about the shooting on the city's east side weren't released, but Williams said at least one adult was home when it happened.

Cleveland.com says the boy's mother could be heard screaming on the back porch after learning her son had died.

Neighbors said the mother lived in the house with at least three small children.