"The grisly discovery of 121 human skulls, many with their tops sawn off, has puzzled Chinese police and caused a frenzy of speculation," he says.
Last month in Dege, I watched the local monastic ceremonial dances, in which, to the beat of drums, around 40 monks danced in a large circle. Each monk held a human scalp in his left hand.
The mystery skulls, sans scalps, were also found in a Tibetan area. Here is a photograph of them (from the Daily Telegraph website):
And here are the Dege monks dancing, scalps in hand: