Milwaukee police say the 4-year-old boy who died from a gunshot wound last week accidentally shot himself.

Authorities said Monday in an email that the boy's 21-year-old mother was arrested and booked on a possible charge of leaving a gun accessible to a child. She has been released and ordered to meet with prosecutors in the Milwaukee County District Attorney's Office next week.

The boy was pronounced dead following the shooting at a north side home last Friday.