Security surrounds a procession with the Olympic torch as it travels down Van Ness Ave. in San Francisco, Wednesday, April 9, 2008.

Tibetan separatists tried to sabotage the Olympic torch relay in the western coastal city of San Francisco on Wednesday.

The separatists tried to grab the torch, but were pushed back by police escorting the torch relay.

(Xinhua News Agency April 10, 2008)