Some streets were sealed off as demonstrators marched waving Tibetan flags.
The Tibet Society of the UK said the march set off from the Chinese embassy, where an open letter which it said featured documentary evidence of torture, was delivered by Tibetan monk Palden Gyatso, who was imprisoned for 33 years.
"It is a shameful indictment of the Chinese government that 50 years after its brutal crackdown on the Tibetan people, they continue using the same policies today," said Philippa Carrick, the society's chief executive.
Activists say regions of Tibet are facing lockdown ahead of Tuesday's 50th anniversary of a failed uprising against Chinese rule which led to the Dalai Lama going into exile in India.
The Tibet Society of the UK said the march set off from the Chinese embassy, where an open letter which it said featured documentary evidence of torture, was delivered by Tibetan monk Palden Gyatso, who was imprisoned for 33 years.
"It is a shameful indictment of the Chinese government that 50 years after its brutal crackdown on the Tibetan people, they continue using the same policies today," said Philippa Carrick, the society's chief executive.
Activists say regions of Tibet are facing lockdown ahead of Tuesday's 50th anniversary of a failed uprising against Chinese rule which led to the Dalai Lama going into exile in India.