Tibet is once again a forbidden zone for foreign tourists. Travel agents say Chinese authorities have told them that foreign tourists are no longer being allowed into the region, and it's not clear how long the ban will last, reports MSNBC. The ban comes at the start of Saga Dawa, a month-long Tibetan Buddhist festival that usually draws thousands of tourists. More than 30 Tibetans have set themselves on fire since March of last year to protest Chinese rule, and the first self-immolations in Lhasa, the Tibetan capital, happened last week. (More Tibet stories.)