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A woman in her 60s and a 6-year-old boy were found with fatal stab wounds in a Pico-Union home after a welfare check Monday night, officials said.

The call came in about 10:35 p.m., Los Angeles Police Department Officer Norma Eisenman told KTLA Tuesday.

Responding officers found the woman and the child with stab wounds. They were pronounced dead by Los Angeles Fire Department personnel who also responded to the scene.

Neighbors told KTLA that the victims are a grandmother and her grandson, but police have not confirmed their relationship.

No arrests have been made, but police said the stabbing appears to be related to domestic violence and is an isolated situation.

Detectives believe a family member might be responsible, but no one else was in the home at the time.

“That’s what’s taking this investigation so long. As they process this scene, they’re finding out who else lives in that residence,” Lt. Raul Jovel said about detectives combing the area for clues.

Investigators remained at the scene Tuesday afternoon as police tape cordoned off an apartment building in the area, aerial video from Sky5 showed.