By Susannah Price BBC, at the United Nations

The UN hopes to keep WMDs and terrorists apart

It means all UN member states will have to pass laws to stop terrorists and black market traders from buying, selling or developing such weapons.

Last year, at the General Assembly, President Bush called for a resolution to tighten international legislation.

Until now it has dealt mainly with weapons proliferation by governments.

This resolution also calls for governments to account for all such weapons, and to develop border controls to prevent illicit trafficking.

The US deputy representative to the United Nations, James Cunningham, said the Security Council was responding to a clear and present threat to global peace and security, namely the proliferation of nuclear, chemical and biological weapons.

A Security Council committee will be set up for two years to report on the implementation.