Russian police have broken up an opposition rally in St Petersburg, arresting about 150 people.
Opposition leader Boris Nemtsov was among those detained, although he was later freed.
The protest was organised by Other Russia, a coalition of anti-Kremlin groups led by former chess champion Garry Kasparov. He was arrested in a separate protest Saturday.
Riot police reportedly moved in when some protesters unfurled banners of the banned National Bolshevik Party and marched towards the Winter Palace, the residence of the tsars.
Dozens of demonstrators were carried off by police.
The Russian people go to the polls on 2 December, with President Vladimir Putin's United Russia party widely expected to emerge victorious.