The break-in happened early Thursday at Winners Wash Laundromat in Quincy.
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Police did not say what the burglar took, but are asking for help finding the suspect.
The Quincy Police Department asked anyone with information to contact them at 217-228-4470 or the Quincy Regional Crimestoppers at 217-228-4474.
Police did not immediately provide further information about the burglary.