Article published on the 2008-06-04 Latest update 2008-06-04 10:29 TU
Relatives of victims held private memorial ceremonies on the eve of the anniversary, some near the square, others in a cemetery where some victims are buried.
The repression of the demonstration is a taboo subject in China. Washington on Tuesday said that Beijing should take advantage of the upcoming Olympics to explain what happened and to release prisoners taken during the protests.
"The time for the Chinese government to provide the fullest possible public accounting of the thousands killed, detained, or missing in the massacre that followed the protests is long overdue," said State Department Sean McCormack.
US-based campaign group Human Rights Watch claims China is holding around 130 prisoners.