Police in London are appealing for information about the whereabouts of a man who said he was "heading in the direction of the North Sea".
More than 350 people have been arrested in the last year thanks to Norfolk Constabulary's campaign targeting drug dealing in the county.
The boss behind a drugs gang responsible for trafficking around £250,000 worth of crack cocaine and heroin into Great Yarmouth and bringing misery to its streets has been jailed for eight years.
Officers are reminding Norfolk residents to be vigilant following another incident involving a cold caller claiming to be a police officer.
Theresa May has warned that Britain is in the grip of a spate of copycat terror attacks in the wake of the London Bridge atrocity.
Police have charged three men in connection with supplying drugs between London and Great Yarmouth.
Officers from Norfolk working alongside the Metropolitan Police made "significant arrests" in warrants across the capital last week under the ongoing campaign against Class A drugs.