There have been many reports by the Chinese saying that violent Tibetans and even violent monks have been responsible for the problems in Lhasa. Please read this report from Canada Free Press that outlines how Chinese authorities have attempted to manipulate the media into reporting that violent monks caused the recent riots - http://buddhism.kalachakranet.org/chinese-orchestrating-riots-tibet.htm

Also another seemingly reliable site is: http://agonist.org/taxonomy_menu/2/3/11/6 which gives news from various sources covering the days since 10th March