[Update] Husband, Wife, Four-Year-Old Twin Boys Found Dead In San Mateo Home

Details remain thin, but police in San Mateo are investigating the deaths of two adults and two children who were found dead inside a home Monday morning in San Mateo's Sugarloaf neighborhood.

The gruesome discovery was made around 9:15 am Monday, as KRON4 reports, when San Mateo police performed a welfare check at the home on the 4100 block of Alameda de las Pulgas.

A male adult, a female adult, and two four-year-old twin boys were found deceased in the home, as ABC 7 reports. Police said there was no sign of forced entry, and this appeared to be an isolated incident.

ABC 7 further reported that investigators appeared focused on a white Tesla parked outside the home with its hazard lights on.

No causes of death have been released.

Update: Police have released very little information as of Tuesday morning, however the county coroner has confirmed that the dead were a family — a husband, wife, and twin boys. No names have been released, and the police have made clear no suspects are being sought, which points to this being a murder-suicide.

Update 2: On Tuesday afternoon, San Mateo police put out a release confirming that the husband and wife were found dead of gunshot wounds inside a bathroom in the home, and a 9 mm pistol was found nearby. The two boys were found in a bedroom, and their cause of death remains under investigation.

This is a developing story.