A worker sets up the stage for the 19th Life Ball in front of the city hall in Vienna May 20, 2011. Life Ball is Europe's largest annual AIDS charity event and will take place on May 21, 2011. [Photo/Agencies]
A supporter (centre R) of Bulgaria's nationalist party "Attack" clashes with a Muslim worshipper during Friday prayers in front of the Banya Bashi Mosque in central Sofia May 20, 2011. Supporters of the party clashed with Muslim worshippers on Friday during a rally organised by the party to protest the use of loudspeakers at the mosque. [Photo/Agencies]
