An adult and child found dead at a property in Merthyr Tydfil 'may have been dead for some time', South Wales Police believe.
The two are understood to be 27-year-old Joanne Thomas and her four-month old daughter Harper, although no formal identification has yet taken place.
Their bodies were discovered at 4.20pm yesterday afternoon inside a property in Church Street, Troedyrhiw.
Police had entered the address after concerns were raised for their welfare.
Detective Superintendent Paul Hurley, of South Wales Police, also said there is 'no evidence to date' to suggest carbon monoxide was a factor in the deaths.
– Detective Superintendent Paul Hurley, South Wales Police
We are currently examining a number of lines of enquiry to establish the circumstances of these tragic deaths and I can confirm the current evidence to date does not suggest that carbon monoxide is a factor in this case.
We believe that Joanne and Harper may have been dead for some time. My appeal is for the community to try their best to recall anything that could be relevant from the past few weeks.
I would like to thank the local community of Troedyrhiw for their support and co-operation so far, and reassure them that we are doing everything we can to find out what happened. What I ask is that they come forward with any information regardless how insignificant it may seem.
Both deaths are currently being treated as unexplained, with officers awaiting the results of a post-mortem to determine the cause.
House-to-house enquiries are continuing in the area and forensic examinations at the scene are ongoing, while a police cordon remains in place outside the property.
Investigating officers are continuing their appeal for information, and an incident room has been set up at Cardiff Central Police Station.
Anyone with information is asked to contact the incident room on 02920 527 303, South Wales Police’s non-emergency 101 number or Crimestoppers anonymously on 0800 555 111.