Authorities are investigating a shocking case of San Francisco suspicious deaths after four people were found dead in a multimillion-dollar home on Monterey Boulevard on Wednesday afternoon. Police say the discovery was made during a welfare check at around 1:23 p.m. in one of the city’s quiet, upscale neighborhoods.

A Rare Tragedy in a Peaceful Neighborhood

According to the San Francisco Police Department (SFPD), the victims—believed to be family members—were found dead inside the home and pronounced dead at the scene. While the cause of death has not yet been determined, two law enforcement sources told KTVU-TV that investigators are exploring the possibility of a murder-suicide.

“This is a very rare occurrence in this neighborhood,” said Officer Robert Rueca, an SFPD spokesperson. “This area rarely sees any type of activity close to this.”

Police have not released the names or ages of the victims. The San Francisco Office of the Chief Medical Examiner is conducting a separate investigation to determine the official cause and manner of death.

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Neighbors Describe the Family as “Quiet and Kind”

Neighbors described the victims as a quiet family who had lived in the community for about a year. One resident, Belinda, who lives next door, told ABC7 San Francisco that the family included two young girls, one believed to be around 12 or 13 years old.

“We didn’t hear anything or notice something unusual,” she said. “They were a quiet family who liked to decorate for the holidays.”

The Spanish-style home, which sold for $1.35 million in 2014, spans 1,755 square feet and includes three bedrooms and one bathroom, according to property records.

San Francisco Suspicious Deaths Under Investigation 

Officers from SFPD’s homicide unit were seen combing through the property and the surrounding area late into Wednesday evening, gathering evidence as investigators worked to piece together what happened.

“Any time you have more than one person deceased, it’s very challenging,” a first responder told Fox News Digital. “We do have support services available for our firefighters and officers to talk to after incidents like this.”

Authorities are urging anyone with information to call the SFPD’s tip line at 415-575-4444 or text TIP411 with the message beginning “SFPD.”

For updates, see KTVU’s coverage, ABC7 San Francisco, and Fox News Digital.

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Four found dead in million-dollar San Francisco home as police probe ‘suspicious’ deaths