Clashes between protesters and security forces in Tibet's main city of Lhasa have left at least two people dead, according to reports.
Rallies have continued all week in what are said to be the largest protests against Beijing's rule in 20 years.
An eyewitness said there were tanks on the street and he had seen people being carried away on stretchers.
This photo was released by the International Campaign for Tibet and shows police in Jokhang Square in Lhasa.
Another photo released by the International Campaign for Tibet also shows the police presence.
Tibetan Buddhist monks leave a ceremony at the historic Labrang Monastery. Troops have surrounded the three biggest monasteries in Lhasa.