The victims were found in the 8000 block of Reseda Boulevard, near Strathern Street, after police were called at about 9:30 a.m., according to Officer Rosario Cervantes of the Los Angeles Police Department's Media Relations Section.
A woman discovered her three grandchildren - all under the age of 5 - slain inside a Los Angeles apartment Saturday morning and their mother gone, police said. "The LAPD would not get involved". The law enforcement agency also revealed that Carrillo was receiving "medical treatment" for unspecified reasons.
Liliana Carrillo, 30, was arrested in Tulare County, about 322 kilometres north of Los Angeles in the USA state of California, after the bodies were found by the children's grandma Saturday morning (local time).
He said there had been no prior calls to police at the residence.
She abandoned her auto and carjacked another vehicle, Jovel said.Carrillo was detained in the Ponderosa area of Tulare County, about 160km north of Bakersfield, police said.
"There's no denying that there are a few mothers in the show who progress from their situations and grow from their troubles but there are others that I am shocked as to how or why they still have custody of their child", she said. "It's hard to process that as a police officer".
Elizabeth Cuevas, who lives in an apartment above the one where the slayings occurred, said she knew the grandmother as a casual acquaintance. Cuevas said she would sometimes see her while walking her dogs.
"She was a ideal little angel", Cuevas said. "She was precious beyond what you could imagine".
The crime doesn't make any sense to her.
"He did everything that he could think of to get his kids back home safely and to get her help, too, because he still loved her".
"She wasn't shy. She was sweet".
She never heard any yelling coming from the apartment, only the sounds of cartoons, which she said could be heard at all hours, sometimes as late as 10 p.m.
"Somebody snapped there, and they snapped in the wrong direction", she said.
One of the children, a girl, was drawn to her Chihuahua, Rosie, Cuevas told the newspaper. It's been going on for several months that she has been unwell.