Chinese police have taken away four more foreign pro-Tibet activists demonstrating near Olympic venues, a rights group says.
The New York-based Students for a Free Tibet said the four unfurled a Tibetan flag and shouted "Free Tibet" south of the National Stadium early on Thursday.
Up to 50 plainclothes police swarmed on the Tibetan-German, a Briton and two Americans, and their whereabouts were unknown, spokeswoman Kate Woznow said.
Two AP photographers were roughed up by plainclothes security officers, forced into cars and taken to a nearby building where they were questioned before being released. Memory cards from their cameras were confiscated.
Meanwhile, five American bloggers writing about Tibet had been detained since early Tuesday, Woznow said.
Five Americans caught unfurling a "Free Tibet" banner the same day had been released, but an American graffiti artist who planned to use laser beams to flash a similar message on buildings in Beijing was still in detention.