Hong Kong national security police have arrested four people, aged 15 to 47, for allegedly conspiring to subvert state power through a Taiwan-based group that advocates for the city’s independence.

The four held different positions in the group, including party secretary, council member, and general members, according to Li.

They were arrested on Wednesday, and their digital devices indicated their activities in Hong Kong, Li said.

Police also found “a proposal urging the US to draft a plan for the rescue of political prisoners in Hong Kong, as well as flags that signify the secession of the country, including those for the independence of Hong Kong, Tibet, Guangdong, and Xinjiang,” Li said in Cantonese.

In February, the organisation held an online press conference in Taipei, during which its members outlined the group’s action plan, including the “obliteration” of the Chinese Communist Party and the “liberation” of Hong Kong, he said.

The group also suggested setting up a temporary national flag and anthem and requested assistance from foreign countries, as well as providing military training for overseas Hongkongers, he added.