Police have launched a murder inquiry after the bodies of two adults and two boys were found in a house.
Richard and Clair Smith and their children Ben, nine, and Aaron, one, were found in a fire-damaged upstairs bedroom of their house in a cul-de-sac in Pudsey, near Leeds, late on Sunday afternoon.
Detectives are thought to be treating it as a case of murder/suicide. No-one else is being sought.
Mr Smith, 37, and his 36-year-old wife are thought to have moved into the modern stone-built house a few months ago. Part of Sheridan Way where the house is located was initially cordoned off amid fears that dangerous chemicals might be present.
Detective Superintendent Paul Taylor, of the West Yorkshire Police homicide and major inquiry team, said: "Initially, we had concerns regarding the release of harmful chemicals or gases.
"Following testing, we no longer have any concerns with regards to those working at the scene and we will continue our investigations. Inquiries are at an early stage and I would ask anyone with information about the incident to contact the homicide and major inquiry team."
Neighbours spoke of their shock.
One woman who laid flowers at the police cordon said her children went to school with Ben. She said: "It's terrible. From what I saw of them, they were very fun-loving, kind and caring - full of life."
Another neighbour, who lives round the corner, said: "It's such a shock. We've been up all night watching what's been going on. This really is a quiet street. You just don't expect it.
"I didn't know them, apart from seeing them around and about. They had two boys. It's just so sad."