Update: San Francisco police have made an arrest in connection with the murder of five people found dead at 16 Howth Street early Friday morning.
San Francisco resident Binh Thai Luc, 35, was arrested this morning on suspicion of five counts of homicide, San Francisco Police Chief Greg Suhr said today at a press conference.
His brother, Brian Luc, 32, was also arrested on suspicion of narcotics possession, being a felon in possession of ammunition and a probation violation.
The two brothers live together. The medical examiner is still trying to confirm the cause of death and the identities of the five people found dead in the two-story Ingleside home, Suhr said.
Three of the victims were discovered around 7:45 a.m. Friday by a family member with a key, who called 911. Police found the other two victims in another part of the house.
A man was found in the threshold of the home, while a man and woman were found in the garage. Another woman was found upstairs and a third woman was found downstairs, according to police.
San Francisco police investigators returned to the Ingleside home near City College of San Francisco where five people were found dead Friday morning.
Police Cmdr. Lyn Tomioka said the crime scene at 16 Howth Street contained too much information to process in a single day.
An officer was standing guard outside the house Sunday morning but it did not appear that evidence gathering was still ongoing.
"It was a very violent homicide scene, as most homicide scenes are, but this was made more complicated by the number of victims," Tomioka said.
Investigators said they were still trying to determine what led to the multiple homicides, which were reported at 7:47 a.m. at 16 Howth Street in the city's Ingleside neighborhood.
The identities of the victims, all of whom are Asian, have not been released by the medical examiner's office, but Tomioka said Friday afternoon that four of them are family members.
A family member with a key entered the two-story home Friday morning and found three people dead, then called 911. Officers then arrived and found the three victims, and also found two others elsewhere in the home, she said.
Police are still trying to determine how the victims, three women and two men, were killed. On Friday, police Chief Greg Suhr said some had been shot.
A man was found in the threshold of the home, while a man and woman were found in the garage, another woman was found upstairs and a third woman was found downstairs, Suhr said.
The case is believed to be isolated to the house and there is no threat to the public, she said.
"(Investigators) absolutely do not believe that this was a random act of violence," she said today.
Several bouquets of flowers lay on the sidewalk, one with a note reading, "R.I.P. Seff, you'll be missed."
Bay City News contributed to this article.