Tributes and flowers have been left at the scene of the collision
North Wales Police are appealing for witnesses to a collision in which a 10-year-old boy who was riding a bike was injured and later died.
Lee Thompson-Walker, of Llanrwst in Conwy county, sustained serious head and chest injuries following the incident on Monday afternoon.
The collision took place on the A470 at Llanrwst near the Central Garage.
All possibilities are being investigated by police, including a possible hit-and-run, officers said.
Reports of a collision involving Lee and a push bike on the road came in to police just before 1620 BST.
He was taken to Ysbyty Glan Clwyd hospital at Bodelwyddan and transferred to Alder Hey Hospital in Liverpool. He died on Tuesday night.
Police know that a number of vehicles passed along the road at the time of the collision and that a large number of people gave assistance at the scene.
But police are still trying to establish the circumstances as to how Lee sustained his fatal injuries and are urging anyone who was in the area at the time to come forward.
A post mortem will be carried out at Ysbyty Glan Clwyd in Bodelwyddan on Thursday morning.
Police said enquiries were ongoing, including the study of CCTV and house-to-house enquiries.
Officers are also appealing to anyone in the area with private or commercial CCTV to come forward.
Anyone with information can contact officers on 0845 6071002 (English language line) or 0845 6071001 (Welsh language line). They can also contact Crimestoppers anonymously on 0800 555 111.