China is targeting citizens studying abroad for their political activism, rights group Amnesty International said Monday, with some students reporting harassment of family members back home.

Beijing does not tolerate political dissent and has used sophisticated tech tools as well as intimidation to crack down on domestic protesters and activists.

And its curbs on political activism are increasingly expanding abroad in the form of "transnational repression," Amnesty International said in a report, citing interviews with dozens of students in eight European and North American countries.