water cannon

Demonstrators take cover from a police water cannon as fireworks, thrown by other protesters, explode around them during a demonstration against the opening of a new road including a part of the Middle East Technical University campus in Ankara...Demonstrators take cover from a police water cannon as fireworks, thrown by other protesters, explode around them during a demonstration against the opening of a new road including a part of the Middle East Technical University campus in Ankara February 25, 2014. Erdogan opened the road across the Middle East Technical University campus and uprooting a large number of trees in the area in Ankara on Tuesday.

Umit Bekta/Reuters

Demonstrators take cover from a police water cannon as fireworks, thrown by other protesters, explode around them during a protest against the opening of a road that intersects part of the Middle East Technical University campus in Ankara.

Firemen spray their water cannon at protesters who are forcing their way closer to U.S. Embassy in Manila, Philippines, Tuesday, Feb. 25, 2014 during a protest against the forthcoming visit of U.S. President Barack Obama. The protesters were also calling for the pullout of U.S. troops in the country under the Visiting Forces Agreement

Bullit Marquez/AP

Firemen spray a water cannon at protesters forcing their way towards the US embassy in Manila on Tuesday during a protest against the forthcoming visit of US president Barack Obama. The protesters were also calling for the pullout of US troops in the country under the Visiting Forces Agreement.

Masked policemen take cover behind shields during clashes at a May Day demonstration on May 1, 2013, in Istanbul.  Several people were injured on Wednesday as Turkish riot police used water canon and tear gas to disperse hundreds of protesters who defied a May Day ban on demonstrations in a central part of Istanbul.

Ozan Kose/AFP

Masked police officers take cover behind shields during clashes at a May Day demonstration in Istanbul. Several people were injured on Wednesday as Turkish riot police used water canon and teargas to disperse hundreds of protesters who defied a May Day ban on demonstrations in a central part of Istanbul, Turkey.