BEIJING (Reuters) - Chinese police joined throngs of tourists in a crowded Tiananmen Square on Sunday, poised to head off any incidents to mark the anniversary of the bloody military crackdown on pro-democracy demonstrations 17 years ago.
With checkpoints at entrances to the square and sentries at subway stops, the security presence in and around China's symbolic political heart appeared no more overt than usual.
But in line with the unspoken policy of "wai song, nei jin" -- relaxed on the outside, vigilant internally -- plainclothes policemen mingled with sightseers following their flag-waving guides, ready to pounce should one attempt to mark the day by unfurling a protest banner, kneeling to pray or laying wreaths.
The security ritual has occurred annually since June 4, when troops backed by tanks shot their way from the outskirts of town to the edge of the square to end rallies for democracy that students had led on the square since mid-April when they had gathered to mourn the death of reformist leader Hu Yaobang. Hundreds, perhaps thousands, were killed.
Students on the square on Sunday appeared more interested in the sites -- Mao Zedong's mausoleum, the Great Hall of the People and history museum flank the square -- than in politics.
"Is today a special day? Is it your birthday?" said Qing Chaoyun, 23, a student from the northern province of Hebei when asked if she knew what anniversary it was.
"Oh, he's talking about the trouble in 1989," said her friend, who declined to give her name. "That was a very long time ago," she said with a giggle.
Anniversaries or the deaths of popular leaders in China have often provided excuses for protest.
There was no special police presence on Fuqiang Hutong, where Zhao Ziyang -- the party secretary toppled in 1989 for sympathising with the student protesters -- lived under house arrest for 15 years until his death in January 2005.
People walking into the alley towards the large red door of his home got little more than a hard stare from several men in plainclothes. Still, dissidents were rounded up ahead of the sensitive anniversary.
Seventeen years ago, students huddled in the night around the Monument to People's Heroes in the centre of Tiananmen Square, waiting for the military assault. It is cordoned off today.
And after China declared martial law in May 1989, students knelt to block subway entrances -- many feared that's where the soldiers might emerge -- and shouted: "Dare to die squad, I fear not death."
Today, tourists emerged to file past uniformed sentries onto the square.
Ahead of the anniversary, the "Tiananmen Mothers", relatives of victims of the crackdown, called for the government to reassess the demonstrations, which the government branded subversive.
China made a payment in April to the mother of one of those killed, the first case of government compensation. But Ding Zilin, a retired professor whose son was killed in the crackdown, has said she doubted it meant any official softening of the official line on Tiananmen.
Taiwan's top opposition leader Ma Ying-jeou told Reuters that the Communists have to politically reassess the Tiananmen protests sooner or later, and the earlier the better.
While protests in China appear unlikely, Hong Kong was preparing for its annual vigil to mark the crackdown, which has drawn hundreds of thousands to Victoria Park in the past. But last year's count was just 45,000 and forecasts of rain could keep the crowds at home on Sunday.
(Additional reporting by Ben Blanchard)