Bulgarian nationals Cvetelina Gencheva and Tsvetanka Doncheva worked with six spies convicted in London.

Bulgarian journalist Christo Grozev told the BBC one method was to use a sledgehammer, and another involved using a "suicide bomber".

Nearly 18,000 social media posts linked to smuggling gangs have been taken down, Home Office says.

Roman Dobrokhotov tells the BBC he thinks Vladimir Putin ordered the operation against him.

Vanya Gaberova is one of several Bulgarian nationals accused of spying for Russia.

Provides an overview of Bulgaria, including key dates and facts about this east European country.

Seventeen years after joining the EU, the two countries are given the green light to join the Schengen zone.

Notes on the media in Bulgaria, including links to broadcasters and newspapers.