Thames Valley Police have named a man they wish to speak to in connection with the suspected murders of a man, woman and girl were found at an address in Didcot, Oxfordshire.
Jed Allen, 21, is being sought in connection with the suspected triple killing.
Investigating officer, Det Supt Chris Ward, head of the Thames Valley Police Major Crime Unit, said: "Thames Valley Police is releasing an image of a man wanted in connection with three murders in Didcot yesterday (23 May).
"The image is of Jed Allen, aged 21. We believe that Jed Allen is related to the victims and that this was a domestic incident.
"Jed is white, about 6ft, of stocky build, and has a distinctive tattoo of a spider on his left hand.
"If you see Jed please do not approach him, instead call 999 immediately."
Officers were called to the property in Vicarage Road after being alerted by a member of the public at 8.23pm on Saturday night (23 May).
Inside they found the bodies of a man aged 44, a woman, 48, and a girl, aged six. Paramedics declared all three dead at the scene. The identities of the victims have not been released and no arrests have been made.
A post mortem to ascertain the exact causes of death of the three is expected to take place today (24 May).
Detective Chief Inspector Simon Steel, of Thames Valley Police major crime unit, is leading the investigation. In a statement he said: "A man, a woman and a girl were pronounced dead at the scene by ambulance staff. Their deaths are being treated as suspicious.
"This is a tragic incident and our thoughts are with the loved-ones of the deceased."
Steel added: "A scene watch is in place in Vicarage Road, which is currently closed with access to residents only.
"I understand this incident will have an impact on the community and residents will be concerned. As you can understand, we are in the early stages of this investigation, but we will work hard to make sure the community is kept updated when we can.
"We would urge anyone with any information about the incident to contact us immediately via 101 quoting reference number 1370 (23/5). Did you see or hear anything suspicious in Vicarage Road? If you did then we want to hear from you."