A man has been arrested and a major incident declared by police probing a murder after four people were found dead in a house.
Cops made the grisly discovery on Sunday morning after being called out to a home in Killamarsh, Derbyshire, after concerns were raised about the people living there.
Derbyshire Police said they were not looking for anyone else in connection with the deaths.
Specially-trained officers are liaising with the families of the deceased, a spokesman said.
Declaring a major incident late on Sunday evening, the force said: "Four people have sadly died at a home in Killamarsh today, and a murder investigation has been launched.
"Officers have been at the scene of the serious incident on Chandos Crescent which was reported around 7.25am."
Detective Chief Inspector Rob Routledge said: "We would really like to hear from anyone who saw or heard anything suspicious in the early hours of this morning, or has any information which they think could help with our inquiries.
"No matter how small you think that information may be, please do get in touch with us.
"It is understandably a worrying time for the community, and we would like to thank them for their patience and understanding at this time. I
"t was important to us that close relatives of those involved were informed before we could give further details about incident.
"Residents will continue to see a large police presence in the area, and patrols are being carried out for reassurance.
"If you do have any concerns, please don't hesitate to speak to them."
North East Derbyshire MP Lee Rowley said: "This is a hugely shocking and tragic event for such a close knit and quiet community, and I know that village residents will be worried and concerned about what has happened.
"The Police have made an arrest and, whilst the news is heartbreaking, they do believe it is an isolated incident.
"Our thoughts and condolences with the family for their loss. We are thinking of them."