Denmark controversially sent the original Little Mermaid statue from Copenhagen to the expo, putting a video replica recorded by dissident Ai Weiwei in its place. Some observers criticized the Hong Kong and Macao Affairs Office's payment for the 9 Hong Kong undersecretaries to inspect infrastructure projects and hold discussions on city-to-city cooperation. Six legislators from the pro-democracy camp boycotted an invitation to the expo by the Shanghai government because of the issue of political reform and the 2010 Hong Kong by-election. The Chinese government postponed the planned visit of 1,000 Japanese youths to the expo in September because of the 2010 Senkaku boat collision incident, which Japanese prime minister Naoto Kan called regrettable.