The woman, who has not been identified, was arrested Thursday morning local time in the southeastern city of Ulsan, a South Korean police official told CNN.
“To have someone in overseas custody in such a short period of time, it’s all down to the help of the Korean authorities and the coordination of our (New Zealand) Police Interpol staff. “, New Zealand Detective Inspector Tofilau Fa’amanuia Vaaelua said in a statement on Thursday.
The woman will remain in custody pending the completion of the extradition process, Vaaelua added. The woman’s identity is concealed to avoid potentially identifying the children.
South Korean authorities confirmed last month that the woman was born in South Korea and acquired New Zealand citizenship “a long time ago”.
The Seoul High Court will now decide within two months whether or not to extradite the woman to New Zealand.
New Zealand police say the children – likely aged 5 to 10 – have been dead for around three to four years.
At the time, police stressed that the family who bought the suitcases was not being investigated.