New Delhi (PTI): China on Friday made its unhappiness clear over US Speaker of House of Representatives Nancy Pelosi meeting the Dalai Lama and her statements on Tibet and warned against any meddling in its "internal affairs" by "any country, organisation and person".

Soon after Pelosi met the Dalai Lama in Dharamsala, Chinese Ambassador to India Zhang Yan said no "country, organisation or person" should "take any irresponsible act or say irresponsible words" on happenings in Tibet.

"We oppose any country, any organisation, any person to interfere in China's internal affairs," Yan told reporters here when asked to comment on Pelosi's meeting with the Tibetan leader.

"On this issue, we have staged clearly, Tibet is China's internal affair. We don't allow anybody to meddle in China's internal affairs. Any attempt to cause trouble to china is doomed to fail," the envoy said.

He said China hopes that any country, organisation or person has "clear understanding of incidents" in Tibet and respond accordingly.

Earlier, after her meeting with the Dalai Lama, Pelosi described the situation in Tibet as a challenge to the "conscience of the world" and asked all freedom loving people to speak out against China's "oppression".

She said the US Congress will continue to meet the challenge of conscience that Tibet offers.