A homicide investigation is underway after four people were found dead inside a home in Sacramento's South Land Park neighborhood on Thursday, authorities say.
Officers went to a home on 35th Avenue near Lonsdale Drive around 7 a.m. to perform a welfare check. When they went in the house, they discovered four bodies inside, KTLA sister station KTXL in Sacramento reported.
Detectives did not reveal how the four victims were killed. The genders and ages of the victims were not immediately released, but Sacramento Mayor Darrell Steinberg said the incident "involved" at least two children.
Investigators say they don't believe the killings were random.
Residents told the station this is the first time they've ever seen crime like this in the area.
"How could you be capable of that," neighbor Java Caldwell said. "What is your thought process to where if you're so angry with life why wouldn't you do something to yourself why take someone else's life."
Caldwell lived in the neighborhood for 30 years.
Sacramento Police were also present in San Francisco later Thursday. There, officers detained a woman at an apartment complex on Pierce Street and Golden Gate Avenue.
It was not immediately clear what, if any, the woman's involvement was.
"It's horrifying ... We don't know the identifies yet of the victims but certainly our heart goes out to the victims and their families, and to the schools because this involved a couple of kids as well," Steinberg said. "And as a city we stand ready to embrace the families and the communities in any way we can to help. It's just horrible."
No additional information was immediately available.