This is the best tl;dr I could make, original reduced by 85%. (I’m a bot)
Four students have been arrested in Hong Kong in the first police operation to enforce China’s new national security law for the territory.
“Our sources and investigation show that the group recently announced on social media to set up [sic] an organisation that advocates Hong Kong independence,” said Li Kwai-wah from the new national security unit inside Hong Kong police.
Authorities in both Hong Kong and mainland China insist the security law will not affect freedom of speech and is needed to quell successive waves of unrest in the city.