People in a quiet suburban street have said they could not understand how a family may have been living in a house with the decomposing body of a young boy.
Police made the grim discovery of the body of a three-and-a-half-year-old boy when they were called to a mid-terrace house in Crofton Road in the Heaton area of Bradford on Wednesday afternoon.
Officers have given out few details about how or where the youngster was found, but it is understood he may have been dead for a considerable period of time - possibly even months.
Neighbours said the house was occupied by a woman and her large family, and that they had lived at the property for about two years.
West Yorkshire Police are questioning a 41-year-old woman and a 22-year-old man. Officers said they are not seeking anyone else in connection with the investigation.
One neighbour, who has lived in the street for six years, said: "It's just such a terrible shock. This really is a quiet area. No-one knows what's happened. It's just incredibly sad."
On Friday, forensic officers wearing white protective suits went into the house to continue their investigations.
Outside, police community support officers guarded the front and back entrances while plain-clothes police conducted door-to-door inquiries in the street.
Bradford Council leader councillor Ian Greenwood said: "Clearly, this is a terrible tragedy.
"The discovery of this child's body has been upsetting and shocking for all of us. The police are keeping us fully informed and we will continue to work closely with them as the investigations continue."