Demonstrators who have been staging a protest in Madrid's Puerta del Sol since March 15 raise their arms in front of Spain's parliament June 8, 2011. Spaniards protesting over the handling of the country's economic crisis continue to keep their tents in central city squares this week, as a wave of similar protests spread to other major European cities. [Photo/Agencies]

F-16 fighters of the Thunderbirds, the US Air Force Air Demonstration Squadron, perform during a Romanian - US airshow at Kogalniceanu airport, 250 km east of Bucharest June 8, 2011. [Photo/Agencies]