Tibetan exile monks stand during a candlelit vigil in New Delhi, India, to express solidarity with the plight of the Tibetan people in Tibet, Tuesday, Oct. 18, 2011.A Tibetan nun has set herself on fire in western China, the latest in a series of self-immolations among the region&#39;s Buddhist clergy, an advocacy group said Tuesday. (AP Photo/Manish Swarup)