MINNEAPOLIS (WCCO) — Firefighters had to return to a Fridley fourplex Sunday after it caught fire for the second time.

Last week, a shed fire spread to the apartment building, located on the 5400 block of 5th Street Northeast. Ten people were displaced.

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Since then, no one has been allowed to stay in the building.

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Then, on early Sunday evening, the fourplex caught on fire again. Authorities said the second fire was not a flare up.

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The cause of the fire is unknown.