Amnesty International says Serbia’s secret service and police have been spying on journalists and opposition activists by installing a spyware on their mobile phones.

Serbian officials installed homegrown spyware on the phones of dozens of journalists and activists, Amnesty International said in a report released on Monday, citing digital forensic evidence and testimony from activists who said they were hacked in recent months.

The Serbian authorities have been using advanced mobile forensics products made by Israeli firm Cellebrite to extract data from mobile devices illegally