Foreign journalists were barred from Beijing’s Tiananmen Square on Wednesday as an Internet clampdown that blocked Twitter expanded to include more blogs on the eve of the 20th anniversary of a bloody crackdown on pro-democracy protests. Authorities have also shut photo-sharing site Flickr and confined dissidents to their homes or forced them to leave Beijing, as they ramped up efforts to prevent online discussions about or commemorations of those who died in the military assault on demonstrators on the night of June 3-4, 1989.
