Dark net drugs adverts 'double in less than a year'

The number of listings offering illegal drugs for sale on the "dark net" appears to have more than doubled in less than a year, BBC News has learned.

The US Federal Bureau of Investigation (FBI) closed down the original online illegal drug market, Silk Road, in 2013.

But figures suggest the trade has actually increased: In October 2013, there were reportedly 18,174 drugs listings across four main markets; a recent BBC News search found 43,175 listings across 23 markets.

Angus Crawford reports.