Forty-one Tibetans who were detained by the Nepalese police while they were on a bus bound for India have been released to a Nepalese human rights group, an advocate for Tibetan rights said Friday.

The advocate, Kate Saunders, of the International Campaign for Tibet, said early Friday in London that the human rights group, the Human Rights Organization of Nepal, and other contacts in Kathmandu, Nepal’s capital, had told her that immigration officials and the police had allowed all the Tibetans to be released.

Ms. Saunders said the Tibetans were mostly from Kham and Amdo, Tibetan regions now ruled by China, and were on a pilgrimage to sacred sites in Nepal and India. It is likely that they planned to go in January to an important Buddhist ceremony, the Kalachakra teaching, in Bodh Gaya, an Indian city, she said.

It is unclear what those Tibetans will do now. They could end up at the Kathmandu transit center of the United Nations High Commissioner for Refugees. From there, many Tibetans make their way to India, against China’s wishes. Ms. Saunders said the Tibetans were in a “very precarious situation.”