"Security forces started beating the Tibetans, causing severe injuries, deployed tear gas and fired indiscriminately into the crowd," it said.
The shooting in Biru county left two protestors in critical condition, it added. One named Tagyal had a broken femur while another called Tsewang was hit in the jaw.
Both human rights organisations report the same, but a curt "no protest, no one injured" statement from the authorities in the region say otherwise. The confrontation came about following requests from the Chinese that Tibetan households fly the Chinese flag to mark the October 1st National Day.