A young boy has died while on a family holiday on the Greek island of Kos.
Theo Treharne-Jones is thought to have died at the Atlantica Holiday Village resort on Saturday.
The five-year-old from Merthyr Tydfil attended Greenfield School in Pentrebach.
The leader of Merthyr Tydfil Council offered his "thoughts and prayers" to Theo's family in a statement released on Tuesday.
A spokeswoman for holiday operator Tui said: "We are aware of the tragic incident at the Holiday Village Kos, Greece and our thoughts are with the family. Our team in resort is currently supporting the family and we will continue to assist in whatever way we can.
"The safety and wellbeing of our customers and staff is our primary concern and our dedicated resort team is working with the authorities and hoteliers. As the matter is currently still under investigation it would be inappropriate to comment further at this time."
Wayne Murphy, head teacher of Greenfield School said: "I am aware of these tragic events and the loss of this lovely little boy, who brought laughter and happiness to everyone.
"Our thoughts and deepest condolences go out to the family and friends at this tragic time."
A spokesman for Merthyr Tydfil council said: "It is with great sadness that the local authority has heard of the death of one of its young pupils - Theo Treharne-Jones - whilst on holiday on holiday with his family on Kos.
"Our thoughts and prayers are with his family at this tragic time.
"The local authority will be supporting the staff at Theo's school and his fellow pupils, as well as supporting the schools which his siblings attend in the county borough."
A Foreign and Commonwealth Office official said: "We are supporting the family of a British child who died in Kos, Greece, and our staff are in touch with the local authorities."
The Sun quoted a spokesman for police in Greece as saying: "It is common for next of kin to be arrested in such circumstances but as is always the case, they were not held in police custody and were immediately freed."
