According to a report from a Madrid-based human rights campaign group, China has more than 100 police stations around the world that monitor, harass and repatriate its citizens in exile.

According to the report, many of these stations are set up through bilateral security agreements.

Forced disappearances in China were tracked by Safeguard Defenders with the help of official Chinese documents.

It said in September that there were 54 such stations.

Some Chinese nationals are forced to return to China from other countries, such as Serbia and Spain, according to the organization.

China's Ministry of Public Security is active in at least 53 countries according to Safeguard Defenders.

China's Ministry of Foreign Affairs told CNN in November that it hoped relevant parties stopped hyping it up. It's not acceptable to use this as a pretext to malign China.

The facilities are for expatriates who need help with administrative tasks, according to China.

According to the Safeguard Defenders report, the offices were opened several years before the stations were set up.

The FBI director told the committee that he was very concerned about unauthorized Chinese police stations in the US.

The Chinese police would attempt to set up shop in New York without proper coordination. He said that it violated sovereignty and circumvented law enforcement cooperation processes.

At least 13 countries are investigating the revelations about the police stations.

The Netherlands and Ireland have ordered Chinese police stations to close.