Some police forces have used sound cannons against protesters, for example during the G20 summit in Pittsburgh.

Reports of deaths and military force being used against protesters were prominent.

A5 Serbia's Foreign Minister ruled out using force against protesters.

He denied that Syria had provoked such an attack by using excessive force against protesters.

There was, however, a brief attempt to use the sedition laws against protesters of the Vietnam War.

Has anyone in the press thought to interview Ray Kelly about the tactics he's using against protesters?

The police used unnecessary and excessive force against demonstrators and protesters, especially in land dispute cases.

Officials have reiterated that they are prepared to use force against protesters.

Media also mention that the police used unnecessary violence against protesters.

People were urged to stay at home to avoid being confronted by the military, which has been known to use force against protesters.