File photo of Chinese artist Ai Weiwei with his installation “Sunflower Seeds” in London…Chinese artist Ai Weiwei throws porcelain sunflower seeds into the air as he poses with his installation “Sunflower Seeds”, in the Turbine Hall at the Tate Modern gallery, in London in this October 11, 2010 file photo. Ai, 53, who designed Beijing’s iconic Bird’s Nest Olympic Stadium, was due to fly to Hong Kong for business on April 3, 2011 morning but was detained at immigration on his way out of the capital city, according to news reports. The studio of the outspoken government critic was also raided by the police, according to Ai’s assistant. REUTERS/Stefan Wermuth/Files (BRITAIN – Tags: SOCIETY POLITICS)