Hong Kong is marking the 25th anniversary of the return to Chinese rule from Britain
Chinese President Xi Jinping is expected to visit Hong Kong in his first trip outside of mainland China since the start of the pandemic.
Government officials have increased their security arrangements, including a closed-loop system, which has shut down many parts of the city.
Journalists from more than seven outlets have also been banned from covering the ceremony.
Authorities say the government is “striking a balance” between journalist access and security.
When Hong Kong returned to Chinese rule, Beijing said it would grant 50 years to keep its capitalist system. It also promised to keep some of the freedoms, which are not enjoyed by mainlanders.
But that changed when Beijing imposed its national security law after anti-government protests in 2019.
Drones have also prohibited and political activists have been told not to protest at this week’s ceremony.
Officials say the national security law ensures stability and individual rights and freedoms.