Post-mortem examinations on the bodies of two brothers found in the boot of a crashed car in Co Mayo have been completed.
Details will not be released for operational reasons.
Toxicology tests were also carried out.
The remains of ten-year-old Eoghan Chada and his five-year-old brother Ruairi were found following a single-vehicle collision at Rosbeg, outside Westport in Co Mayo, shortly before 3.30pm yesterday.
It is thought they had been dead for a number of hours at that stage.
The car, a dark green Ford Focus, was driven by the boys' father Sanjeev Chada.
He sustained minor injuries in the collision and was taken to hospital in Castlebar, where he is still being treated.
Gardaí are liaising with medical staff before interviewing the 43-year-old.
It is expected he will be brought to Westport Garda Station for questioning.
A forensic examination of the crash scene about two miles outside Westport concluded this afternoon.
The car was taken from the scene and brought to Castlebar, where further examinations will be conducted.
The boys had been missing since Sunday evening, when they failed to return to their Co Carlow home from a bowling trip with their father.
Gardaí are trying to piece together the movements of the Chadas between the time they left Co Carlow and arrived in Westport.
They have appealed to anyone with information to contact them.
Detectives are particularly interested in hearing from anyone who may have had contact with Mr Chada or his children between 6.30pm on Sunday and 3.25pm yesterday.
They have appealed to hotels, filling stations, shops, B&Bs and other businesses to review CCTV footage for any sign of the green car or those who were travelling in it.
The hatchback car has a registration of 06-CW-238.