A five-year-old boy who was found dead in a river has been named by police as Logan Mwangi.
Logan's body was found in the Ogmore River in Bridgend county in the early hours of Saturday morning.
South Wales Police said a 39-year-old man, a 30-year-old woman and 13-year-old boy had been arrested on suspicion of murder and remain in custody.
Tributes have been paid to the "kind, funny, polite, handsome and clever" boy, from Sarn.
The police said they were "not looking for anyone else in relation to this incident".
Logan's body was discovered near Pandy Park following reports of concerns for a missing five-year-old in the Sarn area of Bridgend at 05:45 BST on Saturday.
Logan - who was also known as Logan Williamson - was found in the river and taken to Princess of Wales Hospital in Bridgend where it was confirmed he had died.
People living nearby have spoken of their shock at Logan's death.
"It's just devastating," said Jasmine Tapner, clutching a baby in her arms.
"I only live up the road and it's so close to home. It made me never want to let my children out of my sight because I just didn't want anything to happen to them.
"Everyone is in mourning."
She said Logan was a "loving boy, always chatty, smiley when you walked past the house".
Ian Tapner added: "It's such a sad loss of a young lad - he had a bright future ahead of him. Such a loving lad, a kind lad. The community's in shock."
Ch Insp Geraint White said: "This is a tragic incident in which a young child has sadly lost their life.
"We are appealing for anyone who may have witnessed this incident, or who has any information, to get in touch.
"We would ask the public not to speculate about this incident on social media as this is an active investigation.
"If you have any information that can help, please report this to us.
"Our thoughts are with the family and we are supporting them in every way we can."
He added "regular contact" had been made with the boy's family, who were being supported by specialist trained officers.
"The local neighbourhood police team will continue to support and speak to residents in the area, and I encourage people to talk to them if they have any concerns.
"We recognise there are a lot of people in the local community who would like answers about what happened to him."
Huw David, leader of Bridgend council, said: "People throughout Bridgend county borough have been devastated by this shocking news.
"The tragic death of this young child has saddened us all, but Sarn remains a very close, tight-knit community and residents are looking out for one another even as they offer South Wales Police full support in their ongoing investigations."
At the scene, BBC Wales reporter Stephen Fairclough
This is very much a community in shock.
It is very quiet here, there are just a few dog walkers about.
I'm [standing] by a police cordon by a bridge over the River Ogmore and the bridge is cordoned off on both sides.
There are a number of teddies, candles and flowers which are placed nearby, and handwritten messages with words like "RIP angel" and "fly high, little man" written on them.