Investigators from the United States and 16 European countries, including France, Germany and Britain, yesterday "undertook a joint action against dark markets running as hidden services on Tor network," the Europol police agency said in a statement.
Tor is an encryption service that masks a computer user's identifying IP address, allowing them to set up private web connections in what is known as the Darknet -- a hidden network used for both licit and illicit ends.
A total of 414 sites have been seized and closed down in the operation codenamed "Onymous", but Europol declined to say how it had identified vendors and administrators on the supposedly anonymous Darknet.
The operation seized virtual Bitcoins, used to carry out transactions, worth one million dollars (800,000 euros), 180,000 euros in cash as well as unspecified drugs.
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"We are not 'just' removing these services from the open Internet," said Troels Oerting, the head of Europol's EC3 cybercrime unit.
Cybercrime expert Lodewijk van Zwieten at the Dutch public prosecutor's office said: "This is not the end."
"Behind these markets sit people who earn millions of euros. It's their turn next," Van Zwieten said on the prosecutor's website.
US authorities yesterday said they had shut down a reincarnation of the Silk Road online black market bazaar for drugs and other illicit goods and charged its alleged 26-year-old operator.
Blake Benthall was arrested by the FBI in San Francisco on Wednesday and faces charges including conspiring to commit narcotics trafficking, conspiring to commit computer hacking, conspiring to traffic in forged documents and money laundering conspiracy.
He faces a maximum sentence of life in prison if convicted.
Silk Road announced in a message last November it had reopened, declaring it had "risen from the ashes" a month after the US Federal Bureau of Investigation originally took it down.