Riot police officers detain a protester during clashes in Tunis

Riot police officers detain a protester during clashes in Tunis,Tunisia

A man dressed as an armed hostage taker is caught by a net shot by a team of Taiwanese anti-riot police

A man dressed as an armed hostage taker is caught by a net shot by a team of Taiwanese anti-riot police during a drill to prevent bus hijacking prior to the opening of Taipei International Flora Exposition

Rioters hurl stones and bottles during clashes with police following the Schanzenfeststreet festival

Rioters hurl stones and bottles during clashes with police following the Schanzenfeststreet festival 

Alain Robert 'Spiderman' climbs the Lumiere Residential building in Sydney

French skyscraper climber Alain Robert climbs
 the Lumiere Residential building in Sydney

A police rescue squad member, waits as
Frenchman Alain Robert, known as 'Spiderman'
,nears the end of his climb of the twin-towered

A police search and rescue officer grabs French skyscraper climber Alain Robert

'Spiderman', is led away by police after climbing the twin-towered 150-metre (492-foot) tall Lumiere apartment building in Sydney's business district 

Riot police spray water on a high school student during a protest in Valparaiso city

Riot police spray water on a high school student during a protest in Valparaiso city

Police at the site of a suicide bomb attack in Afghanistan.

Police at the site of a suicide bomb attack in Afghanistan.

Paramilitary policemen take part in a training session in a river on the outskirts of Jiaxing

Paramilitary policemen take part in a training session in a river on the outskirts of Jiaxing

A riot policeman falls as he chases after garment workers to disperse them

A riot policeman falls as he chases after garment workers to disperse them during a protest against a new minimum wage in Ashulia

Franck Ribery arrives at a French pimping prevention squad

 Franck Ribery arrives at a French pimping prevention squad

A Nationalist youth jumps into the air

A Nationalist youth jumps into the air after throwing a petrol bomb at Police.

Paramilitary police train with plastic daggers

Paramilitary police train with plastic daggers at a military base in Suining

A demonstrator confronts the police

A demonstrator confronts the police during a protest outside the EDO and ITT manufacturing plants in Brighton, southern England . Demonstrators protested outside the plants, which they say manufacture parts for Israeli weapons, during a demonstration to mark the end of the conflict between Israel and Palestine one year ago today. 
Credit: REUTERS/Luke MacGregor

A Haitian national policeman takes position during riots with looters in downtown Port-au-Prince

Carlos Barria / Reuters

A Haitian national policeman takes position during riots with looters in downtown Port-au-Prince.

A police officer stands guard

A police officer stands guard as drugs are burned in Panama City July 31, 2009. Authorities destroyed and burned more than six tons of cocaine and marijuana confiscated between June and July. said the police press office.

REUTERS/Alberto Lowe (PANAMA CRIME LAW SOCIETY IMAGES OF THE DAY)