San Diego County Sheriff's deputies responded to a potential homicide in Fallbrook Monday night, opening an investigation that remains active as of Tuesday morning.

Deputies were dispatched around 8 p.m. to the 3800 block of East Mission Road following a call reporting an assault with a deadly weapon. Upon arrival, they located one victim and detained one individual. That person had not been formally arrested or charged as of Tuesday morning, according to sheriff's officials.

Fallbrook is a small unincorporated community in northern San Diego County, policed by the San Diego County Sheriff's Department — the same agency that patrols Santee, El Cajon, Lakeside, and the broader East County region. Violent crimes of this nature are relatively rare in the area, and any confirmed homicide draws significant community attention given the tight-knit character of North County's rural communities.

No details about the victim or the nature of the weapon have been released. The Sheriff's Department has not identified any outstanding suspects or issued a public safety warning, suggesting the detained individual remains a person of interest in the active investigation.

Anyone with information about the incident is encouraged to contact the San Diego County Sheriff's Department at (858) 565-5200, or to submit tips anonymously through Crime Stoppers at (888) 580-8477.