SAN FRANCISCO: Three pro-Tibet demonstrators climbed cables on the Golden Gate Bridge on Tuesday to condemn China's government in advance of the Olympic torch's run through San Francisco.

The demonstrators unfurled a giant banner reading "One World, One Dream" and "Free Tibet 08", while at least one of the daredevil protesters could be seen carrying a Tibetan flag, television images showed.

Local media reported that four people had been arrested by California Highway Patrol while the three protestors remained suspended from the bridge. Tourists snapped pictures of the protestors, who were apparently equipped with rock climbing gear to scale the iconic suspension bridge's cables. "They are doing a really good job and nobody is stopping them," a bridge tour guide said as flocks of tourists snapped pictures of the protesters.

San Francisco is on tenterhooks ahead of the Olympic flame's procession through the city, which follows events in London and Paris severely disrupted by pro-Tibet protestors.