San Francisco police said another suspicious fire broke out early Friday morning in the Castro, the fourth such blaze in the last 24 hours.

Officers said the fire was reported shortly before 4:15 a.m. at 4222 18th Street, which houses the Eureka Barber Shop. Authorities said there was minimal damage to the building.

Police and fire investigators are trying to determine if Friday’s fire is related to three others that broke out early Thursday morning in the Castro.

No one was seriously injured in any of the fires.

Photo Credit: nanosmile, via Wikimedia