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SAN DIEGO – One person was killed and three others were injured Friday morning in a crash in East County, authorities said.

According to the California Highway Patrol, the incident began at 8:25 a.m. after a 34-year-old female driver of a Hyundai Sonata traveled off the side of Dehesa Road near the Singing Hills Golf Resort. After leaving the road, the car struck a rock, a tree and a fence.

A 64-year-old passenger sustained major injuries in the single-vehicle incident and was pronounced dead at the scene, according to authorities. A 29-year-old man and a 39-year-old man were also in the car at the time of the crash. The 29-year-old was taken to a nearby hospital for minor injuries while the 34-year-old driver and 39-year-old passenger were also taken to the hospital, but for major injuries.

CHP officials say that alcohol or drugs may be a factor in this incident.

The matter remains under investigation by the California Highway Patrol.

This is a developing story. Check back with FOX 5 for the latest updates.