Detectives are treating the deaths of a woman and two children at a house in Costessey, near Norwich, as murder, Norfolk Police has said.
The force said the deaths of Kanticha Sukpengpanao, 36, Jasmin Kuczynska, 12 and Natasha Kuczynska, eight, are being treated as murder after they were discovered with stab wounds to their necks on Friday.
The death of Bartlomiej Kuczynski, 45, who was also found with a stab wound to his neck, is not being treated as suspicious, and officers are not looking for anyone else in connection with the killings.
The four bodies were discovered by police at a house in Allan Bedford Crescent after a call from a member of the public on Friday morning.
