The death of a "handsome and clever" five-year-old boy has "devastated the local community" in Sarn, the council leader has said.
Leader of Bridgend Council, Huw David, said: "The shocking news has devastated the local community.
"It's a very close, tight-knit community so everyone is feeling this."
The five-year-old boy tragically found dead in the Ogmore River has been named by police as Logan Mwangi.
The body of the youngster was found in the river near Pandy Park, Sarn, after police were called to a report of a missing child at 5.45am on Saturday.
He was taken to the Princess of Wales Hospital, where it was confirmed he had died.
On Sunday evening, South Wales Police announced a 39-year-old man, a 30-year-old woman and a 13-year-old boy, all from the Bridgend area, had been arrested on suspicion of murder.
A force spokesman said on Monday: “Detectives are continuing to investigate the death of a five-year-old boy in Sarn, Bridgend.
“He has been named as Logan Mwangi, also known as Logan Williamson, from Sarn.
“Three people arrested in connection with the investigation, a 39-year-old man, a 30-year-old woman and a 13-year-old boy, remain in custody.”
Officers previously said they were not looking for anyone else in connection with the incident.
The force appealed for anyone with information to contact the major crime team, quoting the reference number 2100268674.
Family friends have paid tribute to Logan, who they described as “kind, funny, polite, handsome & clever”, on social media.
Those wishing to pay their respects were asked to place teddy bears at a lamp-post and footbridge near the scene of the tragedy.
People arrived throughout Sunday and Monday to lay flowers, tributes, toys and teddies in front of the police cordon by the river.
Many of those who came to lay tributes said they did not know Logan or his family but travelled to the area after hearing news of his death.
A number of police cordons were placed around the river, as well as in front of a property on Lower Llansantffraid, the road opposite.
Police officers in white forensic suits were seen entering and leaving the property on Monday.
On Saturday, Chief Inspector Geraint White said detectives were keeping an “open mind” about what happened.
“We are keeping an open mind and are working hard to establish the full circumstances of his death so that we can provide answers to his family,” he said.
“This is an extensive and sensitive investigation, and many people have been affected by this death.
“We would request that respect is extended to all those involved and that people do not speculate about this incident on social media as this is an active investigation.
“As our investigation continues I would like to thank the local community for their understanding and support whilst we carry out further enquiries.”