Police broke up a sixth day of protests in the capital Friday and surrounded a village the day before a memorial at the grave of a student who set himself afire 20 years ago to protest the Warsaw Pact invasion, witnesses said.

Friday's quiet protest by about 300 people in Wenceslas Square in downtown Prague was broken up without violence, unlike previous days when police used force to disperse demonstrators urging more democracy in Czechoslovakia.About 20 minutes after the rally began Friday, a massive force of white-helmeted riot police entered the square, blocked off streets and gradually allowed thousands of bystanders to leave.

Police cars then drove through the square announcing through loudspeakers that the rally was illegal, and officers gradually pushed the protesters toward the wide sidewalks surrounding the area. It took about one hour to clear the area.