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A man had to have his head stitched after being struck by an unknown object.
The victim suffered a deep cut and was taken to hospital for further medical attention.
The 40-year old was seriously assaulted in Strood High Street between the junctions with Commercial Road and The Esplanade.
The unprovoked attack happened between 8.30pm and 8.45pm on Saturday, April 23.
Police are urging drivers with dashcam to check for footage which may assist with the investigation.
Investigating officer, PC Nick Pebody, said: "This was an unprovoked assault that left the victim requiring a large number of stitches.
"We have been completing inquiries in the area, including the examination of CCTV footage, and are appealing for any witnesses to call our appeal line."
Anyone with information is urged to call police on 01634 792209, quoting crime reference 46/76672/22.
You can also call Crimestoppers anonymously on 0800 555111 or complete the online form on their website at www.crimestoppers-uk.org