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Shocking images show what appears to be blood splattered on the pavement where a glass door was smashed.
The pictures were taken this morning outside Warren's hair salon in Church Street in Dover.
Police were called at 3.56am to reports of a disturbance.
No arrests have been made.
Officers are continuing their inquiries.
A Kent Police spokesman said: "Police are investigating a report of criminal damage in Church Street, Dover.
"The window of a business property was smashed overnight between May 11 and 12.
"No arrests have been made and enquiries are ongoing."
Anyone who witnessed anything suspicious or who has further information is asked to call 01843 222289 quoting reference number ZY/025460/18.