Police are investigating the tragic sudden death of a three-year-old boy at a house in Lisburn.
Officers were called to the home in Trinity Terrace, in the Tonagh area of the town, at around 2.20am on Thursday morning.
When they arrived the boy had already died.
A post mortem was due to be carried out yesterday to establish what caused the toddler's death.
A PSNI spokesman said no arrests had been made.
A red toy truck lay in the front yard of the house as officers guarded the property in a patrol car.
Meanwhile detectives from Lisburn CID made door-to-door enquiries to try to establish the circumstances surrounding the boy's sudden death.
Neighbours said residents of the newly refurbished terrace, located behind a Domino's pizza takeaway and near Holy Trinity Nursery School, had moved in to the busy side street just a few months ago.
It is believed the occupant of the home is a young woman aged in her mid to late 20s.