Archbishop Desmond Tutu urged world leaders not to go to the Games
Richard Gere at vigil
Hundreds of pro-Tibet protesters have marched in San Francisco, as the city prepares to host the next leg of the international Olympic torch relay.
Demonstrators carrying Tibetan flags marched to the Chinese consulate to denounce Beijing's policy on Tibet.
Officials have promised tight security for Wednesday's torch relay, following chaotic scenes in London and Paris.
Officials in Beijing have condemned the disruption to the procession but promised that it would continue.
Extra police will line the torch's route as it follows a six-mile (10km) route through San Francisco, starting at 1300 (2000 GMT).
Mayor Gavin Newsom said he had been in touch with officials in the UK and France to discuss ways of handling the protesters.
"I'm not naive to the challenge associated with this event," he said.
At a candle-lit vigil on Tuesday near City Hall, South African Archbishop and Nobel Peace Prize laureate Desmond Tutu urged world leaders not to go to the Games.
"For God's sake, for the sake of our children, for the sake of their children, for the sake of the beautiful people of Tibet - don't go," he said.
"Tell your counterparts in Beijing you wanted to come but looked at your schedule and realised you have something else to do."
Hollywood actor and long-time Tibet activist Richard Gere attacked China's plans to parade the torch through Tibet.
"The game-plan of bringing this torch to Tibet, as if it was a harmonious society, is so patently false and insulting to the Tibetans," Mr Gere told the rally.
But in San Francisco's Chinatown, community representatives held a news conference to call for a peaceful relay and voice pride over China's hosting of the Games.
"If I support the Olympics, of course I don't support the protests," local resident Ling Li told the Associated Press News agency.
"This is the first time China has had the Olympics. We should be proud of this."
The flame was lit in Greece on 24 March and is being relayed through 20 countries before being carried into the opening ceremony in Beijing on 8 August.
Protests have already caused serious disruption to legs in London and Paris. In Paris, the torch had to be extinguished three times, while in London there were 37 arrests.
The demonstrators are protesting over a security crackdown in Tibet after anti-Chinese unrest.
Tibetan exile groups say Chinese security forces killed dozens of protesters. Beijing says about 19 people were killed in rioting.
OLYMPIC TORCH ROUTE Torch lit in Olympia on 24 March and taken on five-day relay around Greece to Athens After handover ceremony, it is taken to Beijing on 31 March to begin a journey of 136,800 km (85,000 miles) around the world
Torch arrives in Macau on 3 May. After three-month relay all around China, it arrives in Beijing for opening ceremony on 8 August
See detailed route on Beijing 2008 official site
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Pro-Tibet protesters gathered ahead of the Olympic torch relay in San Francisco on April 9, 2008.
The Olympic torch relay in San Francisco, California, began today at 1:00 p.m. PDT (UTC-7). It was the only stop for the torch in the United States, as it makes its way around the world to Beijing, China, for the 2008 Summer Olympics.

The route for the torch was materially altered as protesters filled the streets along the planned route. The route, which was originally 10 kilometres long, was shortened by nearly half, according to the San Francisco Police Department. In hopes that all eighty of the scheduled torch carriers would get a chance to carry the torch, the carriers ran in pairs.

The first torch carrier ran as scheduled, but then carried it into a warehouse, from which a motorcycle was observed leaving. The torch was then spotted again on a major street nearly two miles off course.

The rerouting was carefully planned, according to San Francisco Mayor Gavin Newsom, who told ''Associated Press'', that it was because of "a disproportionate concentration of people in and around the start of the relay."

The closing ceremonies were held at San Francisco International Airport instead of the planned waterfront location at AT&T Park.

Matt Helmenstine, 30, a California high school teacher carrying a Tibetan flag told Reuters: "I think it's cowardly. If they can't run the torch through the city, it means that no one is supporting the games."

"This is a once-in-a-lifetime thing for us to see the torch," said Nancy Chan, a local resident, to the ''San Francisco Chronicle''. "There is a lot of politics around it, but that is the great thing about America - the free speech." She and her 4-year-old son ran to the new route when it was announced.

Protestors filling the street in San Francisco. 
At least one protester was arrested, Xiao Tan, 32, of Chinese origin, who tried to unfurl a Tibetan flag. "I'm proud to be Chinese, but I don't like what's happening in Tibet," he told AFP. The ''Vancouver Sun'' reported a number of arrests, but says that violence is limited.

Peter Ueberroth, the chairman of the United States Olympic Committee, said that the right balance had been reached, between preserving freedom of speech for protesters, while still providing an exhilarating experience for torchbearers, as well as preventing a repeat of the chaotic demonstrations that accompanied the torch in London and Paris.

Already Tuesday evening, hundreds paraded with Tibetan flags while chanting "Shame on China". On Monday, protesters hung banners from the Golden Gate Bridge. As the torch went to London and Paris, the torch relay was subject to large scale protests in both cities.

Tight security was planned in advance. Airspace restrictions have been put in place and over 700 security personnel are expected to be deployed including FBI agents. Police leave was cancelled. The United States Coast Guard patrolled the part of the route that was to take the torch along the waterfront at Fisherman's Wharf.

"We are trying to accomplish two goals here. One is to protect the right to free speech and the other is to ensure public safety, and here in San Francisco we are good at both of those things," said Nathan Ballard about the security. Ballard is a spokesperson for San Francisco Mayor's office.

"I am saddened that such a beautiful symbol of the torch, which unites people of different religions, different ethnic origin, different political systems, cultures and languages, has been attacked," said Jacques Rogge, the president of the International Olympic Committee, to the ''Wall Street Journal''.

The Beijing Organizing Committee said in a statement on Monday: "We strongly condemn the actions of the few 'pro-Tibet independence' activists who have attempted to sabotage the Olympic Torch Relay. The Olympic flame belongs to the world and these actions are a serious violation of the Olympic spirit. They are bound to fail and will surely arouse the resentment of peace-loving people who support the Olympic Games."