Statement from South Wales Police
At around 10.20pm last night, emergency services were called to an incident at an address in Trealaw in the Rhondda.
A young child, named locally as Amelia Harris (aged 3) was declared deceased at the property and at this time the death is unexplained.
The Police have said it was aware of Strong concern and reaction but has asked people not to speculate about the incident on social media.
Police officers investigating the incident have arrested a 37 year-old woman. She has been taken to Merthyr Tydfil police station where she is being questioned.
As a result of the ongoing investigation the main route through Trealaw will be closed until further notice and motorists are advised to take alternative routes.
Anyone with any information concerning this incident and who has not already spoken to the police is asked to call us on 101 or Crime-stoppers anonymously on 0800 555111, quoting reference 1800207700.