China's Xi signs HK national security law

Chinese President Xi Jinping has signed a national security law for Hong Kong that has stoked fears among pro-democracy activists in the city and condemnation from governments around the world, state media reports.

Details of the law have not been released. It takes effect as of Tuesday, Xinhua news agency said.

The National People's Congress Standing Committee, a top legislative body, also approved adding the legislation to Annex III of Hong Kong's Basic Law.