Exclusive: The anonymous ‘wanted’ letter contained a photograph of Kevin Yam, a lawyer who has criticised the crackdown on dissent in the territory

• Get our breaking news email, free app or daily news podcast

A small number of Melbourne residents have received anonymous letters purporting to offer a police bounty of $203,000 if they inform on Kevin Yam, an Australian citizen and pro-democracy activist wanted for alleged national security crimes in Hong Kong, linking him to two nearby locations.

A spokesperson for the foreign affairs minister, Penny Wong, told Guardian Australia the letter was “deeply worrying” and that the matter would be raised directly with officials from China and Hong Kong.

Sign up for Guardian Australia’s breaking news email