MINNEAPOLIS (WCCO) — All employees of the Planned Parenthood building in Uptown have returned to work after a brief evacuation.

According to Minneapolis Police Sgt. Catherine Michal, the Minneapolis Fire Department was initially dispatched to the location — 1200 Lagoon Avenue — at 12:09 p.m. on the report of a substance found in an envelope.

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A representative of Planned Parenthood says a suspicious letter arrived earlier Tuesday and normal security protocol was followed, which includes calling the police.

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Minneapolis police and fire crews responded and no harmful substances were found in the package, so everyone was allowed back into the building.

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The evacuation lasted 10 minutes.