Four websites promoting democracy in Hong Kong have been rigged to deliver malicious software, according to a Washington, D.C.-based security company.

The findings show that “dissenting groups, especially those seeking increased levels of freedom, frequently find themselves targeted for surveillance and information extraction,” wrote Steven Adair of Volexity in a blog post.

Security experts have seen an uptick in attacks aimed at spying on activists in Hong Kong, who have led demonstrations in protest of restrictions China has placed on the election for the territory’s chief executive in 2017.

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