Beijing, Dec 10 (Xinhua) Negotiators from the six nations involved in the North Korean denuclearization talks continued their deliberations Wednesday over a verification protocol that eluded agreement for the past three days.The US delegation held bilateral meetings with North Korea and China Wednesday morning.

According to sources, China held bilateral meetings with the other members of the six-party group - Russia, North korea, the US, South Korea and Japan Tuesday over the verification proposals.

China also held a separate meeting with North Korea Tuesday.

North Korea refuses to allow international inspectors to take environmental samples at its nuclear sites to verify if Pyongyang has dismantled its nuclear weapons programme.

China’s top negotiator, Wu Dawei, proposed the talks to focus on three major issues including verification, continuous implementation of the second-phase action plan, and the establishment of a peace and security mechanism in northeast Asia during the opening session of the meeting Monday.