17 Year Old Boy Who Brutal Stabs Mum & Sister Got Arrested (Photos)

A teenage boy reportedly "woke up, took a knife and killed" his mum and sister in a brutal attack at their home for 'no apparent reason'.

Mikhail Doyenkin has been arrested over the brutal slaying of his sister Valentina Doyenkina, 23, and mother Natalia, 51, in St Petersburg, Russia on May 10.

The 17-year-old, who according to Russian State TV has confessed to the crime, has not been able to provide a motive for the killings but told police: "I was sleeping, then I woke up, took a knife and killed."

Officers are also yet to establish reason for the attack, with social media pictures show the accused smiling and seemingly happy with his sister


According to local media, the young woman was training to become an economist.

After allegedly stabbing his mother and sister to death, the teenager left the city and went to the Krasnodar Krai region in south-western Russia where he was arrested near the Black Sea on May 13.

This is the same region where the family used to live with Doyenkin's father, who died a few years ago.

Police say he will remain in custody until July 10, when the final decision on his case will be made.