400 sites including the notorious Silk Road 2.0 believed to have been selling illegal items including drugs and weapons have been shut down.
The sites operated on the Tor network, which is part of the internet unreachable via traditional search engines.
Tor is home to thousands of illegal marketplaces, trading in drugs, child abuse images and extremist groups. Silk Road 2.0 is one of the most infamous illegal sites, dealing with the buying and selling of illegal drugs.
The joint operation between 16 European countries and the US saw 17 arrests, including the arrest of Blake Benthall who is said to be behind Silk Road 2.0.
Six Britons were arrested, including a 20 year old man from Liverpool, a 19 year old from New Waltham, a 30 year old man from Cleethorpes and a man and woman both 58 from Aberdovey, Wales.
According to the National Crime Agency all were interviewed and bailed.
The operation also saw the seizure of Bitcoins worth approximately £632,000.
Troels Oerting, head of Europols European Cyber Crime centre said: "Today we have demonstrated that, together, we are able to efficiently remove vital criminal infrastructures that are supporting serious organised crime.
"And we are not 'just' removing these services from the open internet; this time we have also hit services on the dark net using Tor where, for a long time, criminals have considered themselves beyond reach."
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