BEIJING -- China is set to make Hong Kong national security laws as a related decision was adopted at the national legislature on Thursday.

Deputies to the 13th National People's Congress (NPC) attending the closing meeting of its third annual session voted overwhelmingly to approve the NPC Decision on Establishing and Improving the Legal System and Enforcement Mechanisms for the Hong Kong Special Administrative Region to Safeguard National Security.

The move came after prolonged social unrest and escalating street violence had plunged Hong Kong into the gravest situation since its return to the motherland in 1997.

Presenting the draft to the national legislature last week, senior legislator Wang Chen said increasingly notable national security risks in Hong Kong have become a prominent problem.

There are apparent "weak links" in Hong Kong's existing legal system and enforcement mechanisms in safeguarding national security, said Wang, vice chairman of the NPC Standing Committee.

Considering Hong Kong's situation at present, efforts must be made at the state level to establish and improve the legal system and enforcement mechanisms for the HKSAR to safeguard national security, he said.