CHICAGO (CBS) — Classes will be back in session at Chicago Excel Academy of Southwest in the Marquette Park neighborhood Monday, after an arson late last week.

Police said someone broke into the building at 7050 S. Washtenaw Ave. around 7:30 p.m. Friday night and lit a fire.

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Crews kept the flames to one room.

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No one was injured in the fire.

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As of Sunday afternoon, there had been no arrests.