Resolution 1673 began by reaffirming that the proliferation of nuclear, chemical and biological weapons as well as their means of delivery constituted a threat to international peace and security. It endorsed the work of the Security Council Committee, and noted that not all states had provided a report to the Committee regarding their efforts to implement Resolution 1540. In this context, it regarded the implementation of Resolution 1540 as a long-term task involving efforts at national, regional and international levels.