It appears to be hysteria - the people claiming to be stabbed don't have puncture wounds, didn't actually see a syringe, etc.
It could be Chinese media manipulation to prevent more rioting but I don't think so - the interviews with the doctors were much too realistic to be the usual ham-handed Chinese propaganda.
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"If they can't picture me with a knife, forcing them to strip in an alley, I don't want any part of it. It's humiliating." - windsock