At 11.46am on 27 March 2016, police received a call raising concerns for the occupants of an address in East Park Street, East End Park, Leeds.
Police, fire and ambulance attended the terraced house and found three bodies that are believed to be two women and a man.
A scene is currently in place at the property and enquiries are ongoing to establish the circumstances.
Acting Detective Inspector Mark Atkinson, of Leeds District CID, said:
Our enquiries are at a very early stage and we are currently trying to establish the full circumstances surrounding the deaths. Initial indications are there has been a small fire at the premises.
Forensic post mortems will be held to establish how the three people found inside the property have died.
“We believe the deaths are likely to have occurred in the early hours of Saturday and we would like to hear from anyone who has seen the occupants of the address on Friday.
Anyone with information is asked to contact Leeds District CID at Elland Road via 101 quoting log number 538 or March 27.