HONG KONG (AP) — Hong Kong police on Thursday arrested five trade union members and a court denied bail for four editors and journalists on charges of endangering national security, part of a widening crackdown on dissent in the city.

The five who were arrested are members of the General Association of Hong Kong Speech Therapists, according to local media reports.

The association published three children’s books that authorities apparently suspect are metaphors for the political crisis. The books feature stories that revolve around a village of sheep that has to deal with wolves from a different village. The sheep take action like going on strike or escaping by boat, according to the synopses published on the association’s website.

Police confirmed they arrested two men and three women from a trade union, but did not identify them or the union.

Police said that they are suspected of conspiring to publish, distribute, display or copy seditious publications with the intent to incite hatred, violence and other non-law-abiding acts towards the Hong Kong authorities and the judiciary by the public, in particular young children.

Police said that also froze 160,000 Hong Kong dollars ($20,600) in assets linked to the union.

On Thursday, a Hong Kong court denied bail to four top editors and journalists from the now-defunct Apple Daily pro-democracy newspaper. They were arrested Wednesday on charges of conspiracy to collude with foreign powers to endanger national security.

So far, eight former employees have been arrested. Apply Daily ceased operations in June after $2.3 million in assets were frozen and police raided the newspaper’s offices, confiscating hard drives and laptops.

Following months of anti-government protests in 2019, Beijing last year imposed a sweeping national security law in the semi-autonomous city that critics say restricts freedoms promised to the former British colony that are not found on mainland China.

The law criminalizes secessionism, subversion, terrorism and foreign collusion in the city’s affairs. Since it was implemented, more than 100 pro-democracy supporters have been arrested and many others have fled abroad.

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