Euphoric Chinese crowds chanting "Go Olympics, Go Beijing" cheered the Olympic flame through the capital yesterday at the end of its troubled global relay, but critics refused to be silenced.

US President George W. Bush, en route to Bangkok and then Beijing for tomorrow's opening ceremony, planned to express "deep concerns" over religious freedom and human rights in China.

"America stands in firm opposition to China's detention of political dissidents, human rights advocates and religious activists," Bush will say in a speech in Bangkok today, excerpts of which were released in advance.

A handful of foreign protesters took their chance to grab the spotlight before attention shifts on to the sporting contests.

Police rushed to detain two Britons and two Americans who unfurled "Free Tibet" banners from poles near the main "Bird's Nest" stadium, and stopped other public protests during the day.

The mood in Beijing, though, was one of mounting excitement, with most of the 10,500 athletes from 205 countries now in town.

The first competition, women's soccer, began with six matches. World champions Germany drew 0-0 with Brazil in front of a sparse crowd in Shenyang.

At the weekend, the eagerly awaited swimming competition begins in the new "Water Cube" pool, another shimmering landmark for the Olympics. American Michael Phelps is seeking to smash compatriot Mark Spitz's 1972 record of seven golds in one Games.

Phelps tried to puncture some of the hype yesterday, "You guys are the ones talking about it...I'm not," he told media.

Beaming faces

In Tiananmen Square, Beijing's symbolic heart best-known abroad for the crushing of 1989 protests, one of China's most famous sportsmen, 7ft 6in basketball player Yao Ming, said he was overwhelmed as he held the flame above a sea of beaming faces.

"After lighting it, my mind went blank, and then I just wanted to hurry up running ahead," said Yao, according to news agency Xinhua.

Though not fully fit, NBA player Yao will lead China's team when basketball starts at the weekend, also featuring a US squad pumped to avenge missing gold in 2004.

Children wore "I Love China" T-shirts and workers waved flags and pom-poms, while drums and cymbals resounded around Tiananmen under a portrait of late revolutionary leader Mao Zedong.

China's Communist leaders hope such images of the torch's final passage through the host city will help banish memories of Tibet protests dogging the flame in Paris, London and elsewhere.

The Dalai Lama, exiled spiritual leader of the Tibetan people, who has repeatedly distanced himself from protests against the Games, sent his best wishes to China.

"This is a moment of great pride to the 1.3 billion Chinese people," he said from his home in northern India. "I send my prayers and good wishes for the success of this event."

To protect the athletes and guard against terrorism or protests, a 100,000-strong force is on hand in Beijing.

Authorities intensified security this week after suspected Muslim separatists attacked a group of jogging policemen with homemade explosives, killing 16, in the far west.

The Games have given China an unprecedented chance to showcase its modern face and economic progress but have also galvanised critics of its human rights record.

Police banned US swimmer Amanda Beard from holding a pro-animal rights news conference. Instead, she took to the street to unveil a nude photo of herself saying "Don't wear fur".

The United States said it would protest to China over its decision to revoke the visa of Olympic gold medallist Joey Cheek, an activist for the Sudanese region of Darfur where China is accused of failing to help end the crisis.

Sadly for organisers, the start of the flame's passage through Beijing took place under smog-filled skies.

Some $18 billion of cleanup measures have reduced contamination to safe levels, according to Olympics chiefs, but not produced the sunshine and blue skies China longs for.

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