As it happened: Clashes in Hong Kong as new law kicks in - BBC News
Police make arrests and fire water cannon and pepper spray on crowds marking the handover anniversary.
The new law is seen as wide-reaching, and several elements have left Hong Kongers – even those outside the territory – deeply concerned.

Article 38 of the law specifies that the law applies to offences committed outside of Hong Kong – including by people who are not Hong Kong residents.

One British Hong Konger, who asked not to be identified, said she had started deleting posts critical of the government on social media, as she feared she could be targeted next time she travelled to Hong Kong.

“With the new law I feel I have to self-censor everything now. The law is written quite subjectively – you don’t have any idea of what you may do that may break the law.”

“It feels more oppressive than it used to be – especially because my family members are still in Hong Kong and I’m afraid it may affect them as well.”

Meanwhile, a Hong Kong American told me: “I decided to change my Facebook name and switch to Signal after reading the details of the new law.”

“Since it was written in such a way that could apply to my actions abroad, I feel like it was wise to make it more difficult for people to trace my criticism of China and the Hong Kong government back to me, particularly if I were to return to Hong Kong to visit.”

Hundreds have been arrested at protests in Hong Kong - and many abroad are now also fearful Image caption: Hundreds have been arrested at protests in Hong Kong - and many abroad are now also fearful