The parties broke campaign silence over news of illegal ballots being found at a printing shop linked to Gerb.

BBC: Main party in Bulgaria seeks to void election result

The centre-right Gerb party - led by former Prime Minister Boiko Borisov - is narrowly ahead with nearly all votes counted.

BBC: Bulgaria election fails to end political stalemate

Gerb won nearly 31%, while the socialist BSP party got about 27%.

BBC: Bulgaria election fails to end political stalemate

Ex-Prime Minister Boiko Borisov said his centre-right Gerb party's chances had been damaged by comments from other parties on the eve of the polls.

BBC: Main party in Bulgaria seeks to void election result

Many of the protesters in Sofia and other major Bulgarian cities had demanded the resignation of the centre-right GERB party government and the re-nationalisation of power distributors.

BBC: Bulgaria government to resign, PM Boiko Borisov says