And anti-riot police were on standby as a huge security ring was thrown around Loyalist ghettos.

Students that protested in support of academic freedom where tear-gassed by armed anti-riot police on March 8, 2011 for defying the order not to protest.

For now, the anti-riot police are to be replaced by predominantly black army patrols.

As opposition to the communist government in Poland grew, the units were expanded to counter the growing unrest, and their role became more of anti-riot police.

On 11 May, 1,500 Doctors attempted to march towards government buildings but were prevented by anti-riot police.

Five of them were arrested after confrontations with anti-riot police.

But security has been tight and there are many checkpoints along the fairly quiet roads, manned by anti-riot police and soldiers.

Egypt also deployed 500 anti-riot police along the border.

Soon after, soldiers took positions and anti-riot police patrolled in the township.

In the Aden Governorate, thousands of protesters clashed with anti-riot police backed by tanks.