A series of police operations tackling drug dealing in the city has been carried out.
Officers raided several properties, set up search operations at Peterborough Railway Station, and worked at HMP Peterborough with sniffer dogs to prevent illicit substances getting into the jail.
The first operations took place early on Monday morning, when officers executed warrants at properties including at Mitchell Close, Fengate, Peterborough. Addresses at Barbers Hill and Mellows Close were also raided.
A police spokesman said: “A vulnerable person was identified as occupier of address, suspected to be cuckooed. Safeguarding measures have been put in place.
“Four people were arrested and dealt with at the location for possession of a controlled substance.”
‘Cuckooing’ is where drug dealers take over an address where vulnerable people are living.
On Tuesday morning, an operation took place at Peterborough Railway Station, where officers from Cambridgeshire police worked alongside a team from British Transport Police.
The team used metal detecting arches, passive drugs dogs and behavioural detection officers to stop dealers and users coming into the city.
A 19-year-old man from Hertfordshire was arrested on suspicion of being concerned in the supply of drugs. He has been released with no further action.
On Wednesday, about 200 leaflets were delivered to houses in Morris Street, Buckle Street, Bedford Street, Vergette Street, Mitchell Close, Mellows Way and Fairchild Way.
Three men from Peterborough aged 18,19 and 41 were arrested. The 41-year-old was arrested on suspicion of possession with intent to supply class A drugs. The younger two were arrested on suspicion of being concerned in the supply of class A drugs.
They have all now been released under investigation