The ceremony had been slated to take place Wednesday at Justin Herman Plaza, where thousands had gathered to support and protest the Beijing-bound flame's visit to the city.
Just before the relay began, the torch was rerouted about a mile away from the demonstrators and spectators. Officials say they changed the path because of security concerns.
San Francisco Mayor Gavin Newsom tells The Associated Press that a closing ceremony will still take place, but he would not specify where.

A Tibetan supporter, right, argues with a Chinese supporter at a rally for China's Olympic torch at the Ferry Plaza in San Francisco, Wednesday. / photo: Associated Press
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