China on Saturday demanded that some people with the U.S. Congress stop indulging and supporting the Dalai Lama group in anti-China and separatist activities.

"The Tibetan affairs are purely China's internal affairs, and China firmly opposes any country or any person to interfere in China's internal affairs on the Tibetan issue," Foreign Ministry spokesman Hong Lei said in response to a journalist's question.

The words and actions of the Dalai Lama during the past decades have proven that he is not simply a religious person, but a political exile who has been engaged in separatist activities against China under the disguise of religion, Hong said.

According to media reports, John Boehner, speaker of the U.S. House of Representatives, House Democratic leader Nancy Pelosi and several U.S. congress people met with the Dalai Lama in his current U.S. visit.