By WCCO-TV Staff

MINNEAPOLIS (WCCO) — A small heating device used to thaw a door was the cause of a structure fire at the Federal Reserve Bank Wednesday.

The Minneapolis Fire Department says crews responded to a structure fire at 90 Hennepin Ave. S. around 10:30 a.m.

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Crews checked all floors to find the cause of the fire and found that an employee used a heating device to try to thaw a metal door that was frozen shut, according to the release.

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Crews say the heat from the torch started a small fire in the foam installation that was between the walls near the metal door.

There was no major structural damage to the building.

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