Pema Samdup was detained in Lhasa in March, with family members never formally notified of his arrest.
Lhadar opposed Beijing's rule in Tibetan areas and had been placed on a police 'watch list,' a local source says.
Guarantors whose guests violate terms of their entry to Tibet face demotion or dismissal from their jobs, one source says.
Thubten Pema Lhundrub was detained five months ago, and has not been heard from after refusing to spy on other Tibetans.
Tibetans must choose their own religious leaders free from interference by Beijing, US Ambassador at Large for International Religious Freedom Sam Brownback says.
Geshe Jampel Lobshe, a widely respected religious leader, had trained in India as a young man and then come back to Tibet to teach.
Many jobs remain out of reach, however, with competition from Chinese applicants and required proficiency in Mandarin.
Authorities feared protests in Nepal by Tibetans opposed to Chinese rule and policies in Tibet.
The members of the Tibetan Youth Congress were arrested at various locations throughout Chennai.
Nepal restricts Tibetan delegates from returning from India after key exile meeting in Dharamsala.
The activists were planning to protest a visit by Chinese President Xi Jinping.
Friend thinks Sonam Palden was targeted for WeChat posts critical of Beijing.
Tibetans also stayed away from their major Buddhist temple to avoid offending the government, a U.S.-based Tibet said.
Satellite images show the scope of demolition, while a local source tells of evicted monks and nuns.
In the lead up to the October 1 holiday, the capital of the Tibetan region is under heavy security.
The staged displays mask China's ongoing assault on Tibet's culture, religion, and history, an advocacy group says.
A campaign against 'evil forces' meanwhile targets political dissent and expressions of Tibetan culture and identity, sources say.
Beijing's claims of authority over a future Dalai Lama are part of a 'long-term strategy' to tighten its control over Tibet, one rights group says.