US President Barack Obama (3rd L) bows to Saudi Arabia King Abdullah bin Abdul Aziz Al Saud (2nd R) as French President Nicolas Sarkozy (3rd R) and South Korean President Lee Myung -Bak (L) look on before a family picture with Britain's Queen Elizabeth II (not pictured) at Buckingham Palace, in London, on April 1, 2009. World leaders wrangled Wednesday on how a London summit could fix the global economy as demonstrators attacked a bank in an anti-capitalist riot in the British capital. Demonstrators laid siege to the Bank of England and smashed the windows of a nearby bank that has become a symbol of the financial crisis rescue carried out by the British government which will be discussed at Thursday's Group of 20 summit in the city. AFP PHOTO/John Stillwell/WPA POOL (Photo credit should read JOHN STILLWELL/AFP/Getty Images)
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