SAN FRANCISCO — San Francisco Bay Area health officials were trying to determine if three people who died and five who were sickened after eating Thanksgiving dinner at a church event got sick there or at the assisted living facility where they all lived.

Sutter Delta Medical Center in Antioch said in a prepared statement Monday that it saw eight patients with ‘‘probable food-borne symptoms’’ between Friday and Saturday.

Three of the patients died, four patients were treated and released, and one remained hospitalized, the hospital said.

‘‘We do not believe there is any risk to the general public,’’ said Dr. Louise McNitt, deputy health officer for Contra Costa County.

It’s unclear exactly what caused the illness, she added.

All eight lived at the same assisted living facility and ate a free Thanksgiving dinner at the American Legion Hall in Antioch along with other residents and staff members who did not get sick, McNitt said.

The traditional Thanksgiving dinner of turkey, mashed potatoes, stuffing, green beans, bread, and pies was served by the Golden Hills Community Church, which has held the event for several years.

Associated Press