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Two men from Deal and Folkestone are among three arrested on suspicion of supplying controlled drugs.
The 47-year-olds was arrested along with a 25-year-old man from the Brent area of London.
Officers from the Dover Community Safety Unit, supported by Special Constabulary volunteers, made the swoop executing a search warrant in Cannon Street on Wednesday following reports of drug dealing.
All three men have been released on bail until January 26.
Detective Sergeant Matthew Smith said: "This enforcement activity demonstrates that Kent Police will not tolerate drug dealing"
"I would like to hear from anyone who has any information about the dealing of drugs in the local community, particularly where people are being exploited by those travelling into Kent from London."
Anyone with more information is asked to call Kent Police on 101, quoting Op Evict, or Kent Crimestoppers anonymously on 0800 555111.