"Canada is disturbed by the charges laid against 47 individuals for participating in primary elections in [Hong Kong]," Garneau, who recently abstained from voting for a resolution to recognize China's ongoing genocide against Uyghurs, tweeted.
"We call on authorities to uphold rights and freedoms, in line with China’s [international] obligations under the China-Great Britain Joint Declaration."
The activists were arrested after hosting unofficial election primaries while planning candidates to unseat Hong Kong Chief Executive Carrie Lam. They have been charged with conspiracy to commit subversion of state power.
They are expected to appear in court on Monday and face up to life in prison if convicted.
Garneau did not offer any substantive action to take against China in response to the arrest of the activists.
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