Opposition parties have called on their supporters to protest publicly if President Alexander Lukashenko wins the upcoming presidential election.
Mr Lukashenko, who was been in power for 15 years, is often referred to as Europe's last dictator. Nine candidates are standing against him, but polls are predict he will secure an easy victory.
Opposition candidates say a Lukashenko victory would only be the result of massive electoral fraud.
Oleg Boldyrev reports from Minsk.