OAKLAND, Calif. (AP) — California authorities fear at least one person is dead after an early morning four-alarm fire swept through an Oakland building.

Oakland Fire Battalion Chief Erik Logan says rescuers spotted what looked like a body on the third floor, but crews had to retreat before they could confirm.

Logan said about 50 to 60 people lived in the building, which is in a mixed-use neighborhood of warehouses and auto shops.

Crews rescued seven people, he said.

Other residents told KTVU-TV reporters Monday that they escaped on their own.

KTVU spoke to a resident who said the first floor of the building was a drug rehab center and apartments on the other floors were for recovering addicts.

Firefighters were pulled out at one point after the roof and floors became unstable.

The fire is contained.

Oakland became the site of the deadliest structure fire in the U.S. in more than a decade when three dozen partygoers perished at a warehouse fire in December.

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