The attack took place in Vacaville outside of San Francisco at about 3 a.m. Sunday. The victims were reportedly asleep inside their home when the teenage suspect, who is not being identified due to his age, broke into the residence. Once inside, the teen allegedly raped the girl and stabbed her more than 30 times. The assailant later attacked the girl's younger brother, stabbing him more than 10 times, police said.
According to police, the suspect fell asleep after the attack, and the girl, despite her many injuries, managed to grab her brother and flee to a neighboring home, where the resident called police.
When the Vacaville Police Department SWAT team arrived at the home, they located the sleeping suspect inside and took him into custody without incident. The victims were taken to the University of California, Davis, Medical Center in Sacramento, where they were reported in stable condition.
The teen, who police believe acted alone, has been booked on suspicion of two counts of attempted homicide and multiple acts related to sexual assault. He is being held at Solano County Juvenile Hall pending his next court appearance.
According to the Contra Costa Times, the two young victims were the only ones home at the time of the attack. The girl's parents are divorced and share custody of the children, who were staying with their mother at the time of the attack. Authorities are not commenting on where she was during the assault and stabbing, but police are considering filing child neglect charges against her, Bay Area's KNTV-11 reported.
"Why was my daughter alone that late? She is 13 years old," the girl's father told Oakland's KTVU-TV.
Police say the suspect has a criminal history and is an acquaintance of the girl's older brother, who is currently locked up in juvenile facility, KTVU reported.
A motive in the attacks remains unclear, but the girl's father told the news station that his daughter knew her attacker and questioned him during the attack.
"My daughter asked, 'Why are you doing this?' And he said, 'Out of revenge' or something," the victim's father said.
The suspect's mother, speaking on condition of anonymity, told Sacramento's KCRA-TV that her son is not a violent person and that she believes he is being framed.
"He's crying so much and telling everybody, 'I didn't do it; I didn't do it, Mom,'" the mother said. "I know my heart tells me he didn't do it."
Sgt. Mark Donaldson of the Vacaville Police Department told Sacramento's KTXL-TV that the stab wounds missed all of the victims' vital organs and that they are expected to survive.