SAN FRANCISCO (CBS SF) — A 4-alarm fire caused a warehouse to collapse in San Francisco’s India Basin neighborhood on Saturday evening, according to the San Francisco Fire Department.

Firefighters responded to the fire at the warehouse in an industrial area near Toland Street and Evans Avenue, around 8:50 p.m.

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Lt. Jonathan Baxter, a spokesman for the San Francisco Fire Department, confirmed the building collapsed but said it was not certain if anyone was inside.

The warehouse was attached to a bar and the fire was confined to the two buildings, according to authorities.

The blaze was contained at about 11:35 p.m., according to Lt. Baxter.

The main warehouse collapsed but Baxter said nobody was hurt and the fire is under investigation. Two people who lived in the residential unit were displaced and are receiving assistance from the American Red Cross and city services.

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Smoke from the fire impacted traffic on Interstate 280, causing delays. Authorities were asking the public to avoid the area.

The owner of the restaurant was able to escape the blaze but it wasn’t clear if he was one of the residents of the upstairs unit.

A power pole fell onto SFFD firefighting equipment, Baxter said. Fortunately, no firefighters were injured.

The blaze downed multiple power lines, causing outages for about 5,600 households in the area. At 10 p.m., about 2,000 households were still in the dark. By 1.a.m. power had been restored to all but 20 customers.

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The blaze was contained at about 11:35 p.m. There was no estimate of damage. The cause remained under investigation.