30.000 people gathered on October square of Minsk and marched to the Independence square in protest against falsification of the election results. The peaceful demonstration was brutally beaten up. More than 600 people, including 7 presidential candidates arrested. Most of the arrested were sentenced to short-term freedom deprival (15 days), more than 40 people were sentenced to long terms.
Sources: charter97.org, Leonid Varlamov