The incident unfolded around 8:40 a.m. at the facility on Bauchet Street, according to the Los Angeles Fire Department. All those involved were said to be inmates at the jail.
The seven individuals were overcome by a toxic substance, authorities said, but they did not confirm what that substance was.
One person died at the scene despite life-saving measures that were administered. The condition of the others was not known.
No deputies were injured or involved in the incident. An investigation is underway.
DEVELOPING: We will add more details to this report as they become available.