THE father of a 10 year-old boy, who died after suffering "lacerations" at his Co Antrim home, remained in custody yesterday.
The 38-year-old was has been "assisting police with their inquiries" since shortly after the death of Ryan Busa at the property in Queens Avenue in Glengormley on Sunday afternoon.
Ryan is reported to have died after being attacked by the family dog - believed to be an Alsatian.
He lived at the house with his father, six-year-old brother - who has autism and attends Hillcroft School - and the family dog.
A post mortem examination was due to take place yesterday to determine the cause of death.
Paramedics were called to the scene shortly after midday on Sunday where the Ashgrove Primary School pupil was found covered in blood.
He was taken to the Royal Belfast Hospital for Sick Children for treatment but his life could not be saved.
The family are understood to have lived in the terraced property for around a year and the greater Newtownabbey area for around eight years.
His father, named locally as Marek Busa, is originally from Lithuania.
One neighbour said the Alsatian was kept in the yard at the back of the house.
Detectives from Serious Crime Branch are investigating the circumstances surrounding the death and lead officer Detective Inspector Darren McCartney appealed for anyone with information to contact officers by calling 101, quoting reference number 848 15/10/17.
An attack by the family dog is reported to be one line of inquiry.
