The United Nations General Assembly Wednesday is expected to adopt a treaty designed to combat nuclear terrorism.
The treaty would require governments to prosecute or extradite those who illegally possess nuclear devices and materials. The text also calls for countries to cooperate and exchange information.
A U.N. committee approved the text on April 1 after Pakistan, Cuba, the United States and Iran withdrew proposed amendments that had stalled its passage.
The United States had wanted to add language stating that the peaceful use of nuclear materials should not be used as a cover for developing weapons. That amendment was clearly aimed at Iran, which Washington accuses of having a secret nuclear weapons program.
Iran - which says its nuclear program is peaceful - had proposed language approving the exchange of nuclear equipment and materials for peaceful purposes.
Some information for this report provided by AFP and Reuters.