From The Guardian:

China suffered a propaganda own goal today when a state-organised media trip to Lhåsa was interrupted by protesting monks who accused the government of lying to the outside world.

From a Xinhua report on The People's Daily website:

Foreign reporters tour in Lhasa interrupted, but resumes soon

A tour by overseas reporters to cover the Lhåsa riots was interrupted by a group of låmas at the Jøkhang Temple on Thursday morning, but the media tour soon resumed.

Officer with the Information Office of China's State Council, organizer of the media tour, said the coverage of the reporters would go on as scheduled.