What are the Chinese Ruling Party hiding from the world? Might it be nuclear weapons or illegal weapons storage area or maybe DNA Research Facilities. All these possible answers might be in Tibet and that's the reason why Tibet is on lock down mode. What can be so secretive that Beijing has exiled the Dalai Lama, Buddhist Monks set themselves on fire, poured in security forces and cut all form of communication with the outside world. It is reported that before burning themselves, these Monks and Nuns say "Long live his holiness Dalai Lama", "Let the Dalai Lama return to Tibet" and "Freedom for Tibet". Clearly this is a cry for help to the world to free Tibet from China. If Beijing is not hiding anything then why not give Tibet freedom and recognise Tibet as a country. The world has watched the situation and more and more are aware what's happening.
BBC News - China lock-down seals off Tibetan unrest: