Le Pen backs neither party in presidential vote

France's National Front leader Marine Le Pen has vowed to abstain in Sunday's presidential election run-off vote.

Ms Le Pen told a mass rally in Paris she could back neither President Nicolas Sarkozy nor the Socialist candidate Francois Hollande and told supporters to follow their conscience.

Ms Le Pen won 6.5 million votes - 17.9% - in the first round of the election.