San Francisco police announced an arrest Sunday in the slaying of five people inside a home Friday.

Few additional details were released. Until now, authorities had speculated that the slaying could have been a murder-suicide.

According to a press release, police arrested Binh Thai Luc in connection with the deaths. His brother, Brian Luc, has been arrested and charged with narcotics violations. Both lived together in San Francisco, according to the release.

"The Medical Examiners office is working to determine the cause of death and the identification of the victims," the statement said.

San Francisco police spokesman Albie Esparza said in an interview with the Los Angeles Times that the bodies of the three women and two men were discovered about 7:45 a.m. Friday by a woman who may also be a family member.

Medical examiner's investigator Charles Cecil said the bodies were taken to the examiner’s office by about 3:30 p.m. Friday. He said an examination would probably be done Monday and provided no additional details on the causes of death.

Esparza said authorities got a call from a woman with access to the house, which is near a private high school and City College. When she arrived, she found a man dead in the foyer and two more bodies in the garage.