Reuters reports:
Hackers working for the Chinese government have broken into telecoms networks to track Uighur travelers in Central and Southeast Asia, two intelligence officials and two security consultants who investigated the attacks told Reuters.
[…]
As part of the campaign, different groups of Chinese hackers have compromised telecoms operators in countries including Turkey, Kazakhstan, India, Thailand and Malaysia, the four sources said.
Read more on Reuters. Not surprisingly, China has strongly denied all accusations of such activity.