(First Row from L to R) Britain's Prime

(First Row from L to R) Britain's Prime Minister Gordon Brown, Britain's Queen Elizabeth II and Brazilian President Luiz Inacio Lula da Silva, (Second Row from L to R) Dutch Prime Minister Jan Peter Balkenende, South African President Kgalema Motlanthe and US President Barack Obama, (Third Row from L to R) Thai Prime Minister Abhisit Vejjajiva, Japanese Prime Minister Taro Aso and Italian Prime Minister Silvio Berlusconi pose for a family photograph 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/Kirsty Wigglesworth/WPA POOL (Photo credit should read KIRSTY WIGGLESWORTH/AFP via Getty Images)