CANBERRA, Australia — Two Canadian lawyers came to Australia’s Parliament House on Monday to persuade lawmakers to pass a motion urging China to immediately end the practice of what they say is organ harvesting from prisoners of conscience.

David Kilgour, a former prosecutor and Canadian secretary of state for the Asia-Pacific, and David Matas, a human rights lawyer, have published evidence they say shows that China performs an estimated 60,000 to 100,000 transplants a year.

They argue that killing Falun Gong practitioners, Muslim Uighurs, Tibetan Buddhists and Christians was the only “plausible explanation” for sourcing of so many organs.

China had a duty to explain where the transplant organs came from, their report said.

China says it performed 10,057 organ transplants last year and has not harvested organs of executed prisoners since January 2015.

The Chinese Embassy in Australia did not immediately respond to a request for comment on Monday.

The U.S. House of Representative passed a resolution in June calling on the State Department to report annually to Congress on the implementation of an existing law barring visas to Chinese and other nationals engaged in coercive organ transplantation. The resolution also condemns persecution of Falun Gong, a spiritual group China calls a cult and has outlawed.

China accused Congress of making “groundless accusations.”

The European Parliament passed a similar declaration in July calling for an independent investigation of “persistent, credible reports on systematic, state-sanctioned organ harvesting from non-consenting prisoners of conscience” in China.

Kilgour said the Australian government was reluctant to accept evidence of large-scale, forced organ harvesting in China. Kilgour blamed Australia’s close economic ties with China, its largest trading partner.

“The greatest amount of skepticism seems to be in Australia,” Kilgour said.

Kilgour and Matas first published a report on organ harvesting in China in 2006, which became the basis of their 2009 book “Bloody Harvest. The Killing of Falun Gong for their Organs.”

Australian Department of Foreign Affairs and Trade First Assistant Secretary Graham Fletcher told a Senate committee last month that he had doubts about the credibility of Falun Gong reports of forced organ harvesting.

“They are not given credence by serious human rights activists,” Fletcher said.

He said Chinese were not being executed for being Falun Gong followers or Christians.

Such claims have been around for years but have not been independently verified in part because China’s opaque legal system makes such independent inquiries virtually impossible. It’s also not a cause that’s advocated by most international human rights groups. China says it has reformed its system to eliminate the harvesting of organs from executed prisoners, although doubts remain about how completely that ban has been enforced.

The Australian Health Department said at least 53 Australians travelled to China for organ transplants between 2001 and 2014.

Around 200 Falun Gong practitioners demonstrated outside Parliament House against forced organ harvesting on Monday as Matas and Kilgour addressed a meeting of lawmakers from several political parties.

Government lawmaker Craig Kelly said he was considering moving a motion condemning forced organ harvesting which could be put to the House of Representatives early next year. A draft urges China to immediately end the practice.