Federation of Students representatives Alex Chow Yong-kang (second left), Eason Chung Yiu-wa (second right) and Nathan Law Kwun-chung (right) talk to the media before trying to board a plane to Beijing on Saturday. They were told that Beijing authorities had revoked their travel documents. Jerome Favre/EPA/Landov hide caption

itoggle caption Jerome Favre/EPA/Landov

Visitors walk past a portrait of late communist leader Mao Zedong on Tiananmen Gate in Beijing on Sept. 30, the eve of National Day. Greg Baker/AFP/Getty Images hide caption

itoggle caption Greg Baker/AFP/Getty Images