Hong Kong authorities have intensified their crackdown on 16 overseas activists accused of endangering national security by banning their financial support and cancelling most of their passports.

The activists were among 19 people who were targeted with arrest warrants in July for alleged roles in Hong Kong Parliament, a group called a subversive organisation abroad by police.

The measures, announced on Monday, were implemented under the authority of Hong Kong's locally enacted national security law introduced last year.

Three of the original 19 activists were already targeted by similar measures last year. Travel documents were cancelled for 12 of the 16 who hold Hong Kong passports.

Hong Kong Secretary for Security Chris Tang banned providing funds or economic resources to the 16 act

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