Democratic Party lawmaker, Sin Chung-kai, says the 'One Country, Two Systems' principle is on the verge of collapse.
Speaking on RTHK's Letter to Hong Kong, he said the whole of Hong Kong has been horrified by the mysterious disappearance of five men linked to a bookstore in Causeway Bay which sold material critical of mainland leaders.
“It is totally terrifying. Mainland officers make arrests in Hong Kong, a clear breach of the Basic Law", he said.
Sin also said Hong Kong people were worried that their lifestyle was being threatened. He then criticised the Chief Executive, CY Leung, saying he had not stood up for Hong Kong and that his rule was a disaster.
Earlier this month, Leung said there was no indication that mainland security agents had been involved in the disappearances, and that it would be unacceptable for mainland law enforcement personnel to carry out their duties in Hong Kong.
The men went missing between October and December last year. The last to disappear, Lee Bo, was last seen in Chai Wan at the end of December. Three others had earlier disappeared whilst on the mainland. Another, Gui Minhai, disappeared in Thailand.
Lee holds a British passport and Gui Minhai is a Swedish national. The United Kingdom, the European Union and the US have expressed concern over the disappearances.