From AFP via the Taipei Times:
A former Tiananmen prisoner has been detained and other dissidents placed under house arrest or tight surveillance ahead of the 20th anniversary of the crackdown, activists said yesterday.
Wu Gaoxing (吳高興), who was jailed for two years after he protested in 1989 in Zhejiang Province as the pro-democracy demonstrations were taking place in Beijing, was taken away on Saturday, fellow activist Chen Longde (陳龍德) said.
Wu had just written an open letter to Chinese President Hu Jintao (胡錦濤) seeking economic redress for those jailed after the army crackdown on and around Tiananmen Square on June 4, which killed hundreds and possibly thousands.