CHESTERTOWN, Md. (WJZ) — WJZ has learned what sparked a destructive fire at Washington College in Chestertown.

The State Fire Marshal’s Office says the four-alarm blaze started in a plastic smokers’ receptacle.

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The building was being leased by the college and used for the school’s finance and IT departments.

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No one was inside at the time.

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The fire is estimated to have caused $3.5 million in damage.