While requirements for entering Lhasa were already stringent, on March 1, 2012 authorities in the Tibet Autonomous Region (TAR) began requiring any ordinary citizen seeking to enter the TAR to show four different identity cards, and this image was posted by Tibetan writer Woeser on her blog. The consequences were devastating for Tibetans from the eastern Tibetan areas of Kham and Amdo. More than half of all Tibetans live outside the TAR in Tibetan areas of Qinghai, Sichuan and Gansu, but many of them live or work in Lhasa and large numbers travel there frequently on pilgrimage, as it is the religious and cultural centre of Tibetan Buddhism. There are no bars on Chinese businesses or Chinese tourists or migrants entering Lhasa.