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The BBC's James Reynolds is blocked from filming near Tiananmen Square
Chinese police have ringed Tiananmen Square, to prevent people marking the 20th anniversary of the massacre.
The clampdown came as China angrily rejected calls for a review of the 1989 crackdown in which hundreds, possibly thousands, of people were killed.
US Secretary of State Hillary Clinton urged Beijing to examine the "darker events of its past".
But Chinese foreign ministry spokesman Qin Gang said Mrs Clinton had made "groundless accusations".
Open debate about the Tiananmen killings is forbidden