This is an odd one. Yunnan province has borders with Burma, Laos and Vietnam. Yunnan is noted for a very high level of ethnic diversity. It has the second highest number of ethnic groups among the provinces and autonomous regions in China.
Approximately 1 million Muslims live in Yunnan, out of a population of 45.7 million (2009).
It only takes a few.
And if just 1% is in the mood to go jihadi, that's 10,000 killers.