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Protesters surround Police vans close to Spain's Parliament during a demostration in Madrid, September 25, 2012. REUTERS/Andrea Comas

Riot police surround a huddle of demonstrators outside the Spanish parliament in Madrid, September 25, 2012. REUTERS/Susana Vera

Protesters scuffle close to Spain's Parliament during a demostration in Madrid, September 25, 2012. REUTERS/Andrea Comas

Police charge at demonstrators outside the the Spanish parliament in Madrid, September 25, 2012. REUTERS/Paul Hanna

A protester lies injured on the ground after riot police charged demonstrators outside the Spanish parliament in Madrid, September 25, 2012. REUTERS/Susana Vera

Demonstrators take down the first barrier that cordons off the Spanish parliament in Madrid, September 25, 2012. REUTERS/Susana Vera

A restaurant proprietor pleads for protesters to stop throwing rocks which were damaging his restaurant as police charged demonstrators during an anti-austerity demonstration outside the Spanish parliament in Madrid September 25, 2012. REUTERS/Paul Hanna

A demonstrator kneels before the riot police outside the Spanish parliament in Madrid, September 25, 2012. REUTERS/Susana Vera

A policeman clubs a protester after police charged demonstrators outside the the Spanish parliament in Madrid, September 25, 2012. REUTERS/Paul Hanna

A protester screams as he is dragged away by police after police charged demonstrators outside the the Spanish parliament in Madrid, September 25, 2012. REUTERS/Paul Hanna

An injured protester lies on the ground after demonstrators scuffled with police outside the the Spanish parliament in Madrid, September 25, 2012. REUTERS/Paul Hanna

Israel is widely understood to possess a sizable nuclear arsenal but maintains a policy of nuclear ambiguity. Based on estimates of the plutonium production capacity of the Dimona reactor, Israel has approximately 100-200 advanced nuclear explosive devices. REUTERS/Jerry Lampen

Pakistan is believed to have stockpiled approximately 580-800 kg of highly enriched uranium, sufficient amounts to build 30-50 fission bombs. According to the United States, China helped Pakistan by providing nuclear-related materials, scientific expertise and technical assistance. REUTERS/Stringer

North Korea tested its first nuclear explosive device in October 2006 and its second in May 2009. REUTERS/Stringer

India has formally declared itself a nuclear weapon state. New Delhi is likely to have manufactured weapons-grade plutonium for at least 100 warheads. REUTERS/Army Handout

China is estimated to have about 400 strategic and tactical nuclear weapons, and stocks of fissile material sufficient to produce a much larger arsenal. REUTERS/David Gray

Britain's nuclear stockpile consists of fewer than 200 strategic and "sub-strategic" warheads on four Vanguard-class nuclear-powered ballistic missile submarines. REUTERS/Luke MacGregor

France has pared down its arsenal to approximately 300 nuclear warheads. REUTERS/Benoit Tessier

Russia is estimated to have around 14,000 nuclear weapons, although the total is uncertain because there is no accurate count of tactical weapons. REUTERS/Denis Sinyakov

According to the counting rules in the Strategic Arms Reduction Treaty (START), the United States has an estimated 5,200 nuclear warheads and 2,700 operationally deployed warheads. REUTERS/Jung Yeon-Je/Pool