Everything seemed rather ok with elections until Lukashenko started to cheat with results (made 80% out of 50%), because he is really scared of the second tour where Moscow could support a different candidate. But the opposition crowd also acted very stupid (or it was a provocation? Although it doesn't look so from the videos that I've seen) trying to capture the goverment building (breaking doors, etc.):



So goverment forces had to act strictly to prevent a putsch.