Havering Police seized £35,000 during a day of action against drug dealing on Wednesday.
The force arrested 10 people for a variety of offences, including possession of a controlled substance with intent to supply, handling stolen goods and possession of CS spray.
It was part of London-wide activity by the Met called Operation Hawk.
Insp Clare McCarthy said: “We had some fantastic results locally which has no doubt disturbed criminal activity in Havering.”
Anyone with information about drug dealing is asked to contact their local Safer Neighbourhoods Team or call 101.
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