OAKLAND -- Firefighters quickly contained a smoky warehouse fire that broke out Tuesday morning in an industrial area near San Leandro Bay.

The blaze was reported at 10:40 a.m. in the 4900 block of Tidewater Avenue, fire officials said.

Officials said the fire started in a room inside the warehouse, with the cause being fault or failure of an electrical extension cord.

Some people were inside the warehouse when the fire started but got out on their own, officials said.

Two dozen firefighters responded to the blaze, which was under control by 11:13 a.m.

No injuries were reported. The 4,000-square-foot metal storage warehouse, used to store personal belongings that include a vintage auto, belongs to Robert Swinford, owner of Reliable Roofing.

Swinford thanked firefighters after the blaze was contained. He had been in his office nearby when it started and was alerted by a nearby business.

Battalion Chief Erik Logan estimated damage to be at least $100,000.