Four men have been arrested in the UK over their role in illegal online marketplace Silk Road.
Three men in their early 20s were arrested in Manchester while a fourth man, in his 50s, was detained in Devon.
The men were initially arrested on suspicion of drug offences. More arrests are expected in the coming weeks.
Such sites would be a "key priority" for the UK's National Crime Agency (NCA), its director general said.
The Silk Road, one of the world's largest websites selling illegal drugs, has now been closed down.
Ross Ulbricht, the alleged operator of the site was arrested in San Francisco by the FBI at the beginning of October.
Last week 40-year-old Steven Lloyd Sadler was arrested in Seattle. He is alleged to be one of the most prolific sellers on the Silk Road.
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