Homicide detectives were investigating after three people were killed in an upscale gated community in Newport Beach on Wednesday.
Paramedics responded to a medical emergency on a street named Palazzo in the Bonita Canyon development just after 9 p.m., Newport Beach fire officials said.
The incident is being investigated as a triple homicide, according to Heather Rangel, a public information officer for Newport Beach police.
A suspect was detained and there is no threat to the public, Rangel said.
Police were not releasing any other information about the case.
Video from the scene showed a large law enforcement presence on the street, which was partially blocked off with crime scene tape.
No further details were immediately available.
KTLA's Nidia Becerra and Matt Phillips contributed to this report.