A man and a woman will appear in court charged with murdering two boys aged 13 and 14.
The woman also faces three counts of attempted murder following the incident at a house in the Shiregreen area of Sheffield on Friday.
South Yorkshire Police previously said a 37-year-old man and a 34-year-old woman had been arrested on suspicion of murder, and on Sunday it said a man and a woman were charged to appear at Sheffield Magistrates’ Court.
The spokesman said: “The two cannot be named for legal reasons. Anyone who chooses to name them could be charged with contempt of court.”
The force said on Saturday that four other children who were “rescued” from the house had been released from hospital.
They are aged 11, 10, three, and seven months – and cannot be named for legal reasons.
Officers were called to the semi-detached house in Shiregreen at around 7.30am on Friday.
Detectives have given no indication about the nature of the incident, but have confirmed it was not a shooting, and said it was confined to one property.
A spokesman said detectives are not looking for anyone else in connection with the incident.
People living nearby saw more than a dozen police cars and four ambulances arrive in the tree-lined road and an air ambulance land in the grounds of Hartley Brook Primary Academy.