Who killed whom first?

Tibetans randomly beat and killed Chinese solely on the basis of their ethnicity: a young motorcyclist bludgeoned in the head with paving stones and probably killed; a teenage boy in school uniform being dragged by a mob. When authorities did regroup, paramilitary troops fired live ammunition into the crowds. Witnesses did not see protesters armed with anything other than stones, bottles of gasoline or a few traditional Tibetan knives. (link)

Um, excuse me... Which is first - the egg or the chicken?