OAKLAND — Firefighters extinguished a one-alarm arson blaze at a homeless encampment early Sunday, fire officials announced on social media.

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Richmond fire reported near homeless camp by I-580 Details about the fire were scarce, but Oakland Fire Department officials said on their official Twitter account that an arson suspect was in custody. Police did not immediately have any information.

The fire happened around 1 a.m. at Fifth and Market streets, according to an Oakland Fire dispatcher and the agency’s Twitter account. There were no reported injuries, and crews put out the fire in less than an hour, the dispatcher said.

Fire officials did not have any other information immediately. The encampment was near an on-ramp to Interstate 880. Check back for updates.