A 43-year-old woman in Yokohama was arrested Wednesday on suspicion of murdering her daughter and attempting to murder her son.

Ai Kamishige, who lives in Yokohama’s Kohoku Ward, allegedly strangled her 11-year-old son and drowned her 5-year-old daughter in a bathtub, the Kohoku Police Station said Thursday.

According to the police, the incident came to light after the suspect’s husband called the police when he found the children unconscious on the second floor after coming home. The daughter died shortly after.

The suspect has reportedly admitted to the charges during police questioning and said that "there's no mistake about it."