It happened in Reynard's Way in Bricket Wood
Armed police carried out an early morning raid at a house.
Police executed a warrant at an address in Reynards Way, Bricket Wood, at around 7am.
A small quantity of cocaine was seized, a spokeswoman for Hertfordshire Constabulary confirmed.
No arrests were made.
A witness reported a police van, a firearms police car, and a number of unmarked police vehicles attended the scene.
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