A nurse smashes a picture of Bahraini Prime Minister Sheikh Khalifa Bin Salman Al Khalifa at Salmaniya hospital in Manama February 20, 2011. Thousands of anti-government protesters camped overnight in a Manama square that has come to symbolise their cause, as calm returned ahead of talks on Sunday between the opposition and the Bahraini crown prince. REUTERS/Caren Firouz (BAHRAIN - Tags: POLITICS CIVIL UNREST IMAGES OF THE DAY)

Sheikh Khalifa bin Salman al-Khalifa, Prime Minister of Bahrain, looks on after receiving the 2006 Special Citation of the Habitat Scroll of Honour during the Economic and Social Council (ECOSOC) meeting at the United Nations European headquarters in Geneva July 2, 2007. REUTERS/Denis Balibouse (SWITZERLAND)