China said Tuesday that its investigative process has wrapped up for two Canadians detained in the communist country over vague espionage-related charges, hinting at the possibility of trials, exactly one year since they were first arrested.

Former diplomat Michael Kovrig and businessman Michael Spavor have been languishing in China's opaque legal system since they were detained on Dec. 10, 2018, in a case widely seen as retaliation for the arrest of a top executive of Chinese telecoms giant Huawei Technologies Co.

The pair's detention began just nine days after the arrest of Huawei Chief Financial Officer Meng Wanzhou.