A Hokkaido teenager suspected of killing her mother and grandmother said she wanted to escape after they "harshly disciplined" her, police investigators said Thursday.
The 17-year-old high school student allegedly stabbed her mother, 47, and grandmother, 71, with a kitchen knife at their home in the town of Namporo, Hokkaido, early Wednesday. She was arrested later in the day.
The girl admitted to the allegations after initially denying them and did not express remorse, the investigators said.
Police say the bodies of the mother and grandmother were found face down in separate bedrooms with multiple stab wounds in the neck and chest.
The police quoted the student as saying she "wanted to get out of her current situation."
Neighbors said the parents were known to be strict ever since she entered elementary school, making her do household chores such as clearing snow and walking the dog, rather than letting her play with friends.
Police suspect the teen's frustration built up to the point that she attacked the pair while they were asleep.
Local media outlets initially reported the names of the slain but began withholding their identities after the teen's arrest.
Information from the girl led to the discovery of a knife thought to be the murder weapon, in a park less than 5 km from the house.
The bodies were found by the teen's 23-year-old sister when she returned from work at around 2:30 a.m. on Wednesday.