Williams, who is based in Nepal, says Asian smuggling routes run from India through Nepal to Tibet and into other regions of China or through northern Myanmar to China.
"Beyond, when it heads into Tibet, it's a black hole," he says.
China has in the past supported an array of insurgent groups in Assam and other areas of India's northeast that have sought independence from India, and growing economic and transport links are facilitating wildlife trafficking.
Last month, Seven Sisters Post, an English-language newspaper in Assam, reported that the United Liberation Front of Assam and another rebel group have been approached several times by the Longhui Pharmaceutical Company, a subsidiary of arms manufacturer Hawk Group, to supply rhino parts in exchange for weapons, something the groups claim they rejected.
The web site of Longhui, based in Hainan province, says the company produces rhino horn medicine through "shaving alive rhino horn technology."
J.N. Choudhury, Assam's police chief, declined to comment on the report, which the government is investigating, but said members of the Karbi Longri NC Liberation Front have been arrested in recent weeks on charges of rhino poaching in and around Kaziranga. News reports say other rebel groups are also involved.
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