Some of the hard-line group prevented other protesters from boarding trains to get here.

The police had set up a plastic fence in front of the camp to prevent protesters from getting to the camp's wire fence.

Within sight of such an action, the property was demolished after hours to prevent protesters from mounting a demonstration.

The city subsequently built a chain-link fence around the two squares to prevent protesters from returning to the camp site.

In some countries, a buffer zone is enforced to prevent protesters from standing within a certain distance of the clinic entrance.

The officers are trying to prevent protesters from interrupting construction.

Officers stood guard outside the building to prevent protesters causing any more disruption.

In Gdynia, the soldiers were instructed to prevent protesters from returning to factory buildings.

The laws or bills do not try to prevent protesters from speaking out.

The authorities have generally tried to prevent protesters from leaving university campuses, so these plans set the stage for a major confrontation.