Police have arrested and charged a 40-year-old woman with murder in relation to the death of three children in Timaru.
The woman is due to appear in the Timaru District Court this morning.
A scene examination will continue at the Queen St address on Saturday.
"As this matter is now before the courts, police will not be making any further comment," police said in a statement.
The children have been identified as South African-born 6-year-old Liane Dickason and twin 2-year-old girls Karla and Maya.