The UN General Assembly has adopted an international convention aimed at stopping nuclear terrorism.
Adopted by consensus and not a vote, the convention is an addition to the 12 other anti-terror conventions already in place.
It gives legal definition to virtually all variations of potential terrorist acts.
It will be open for signature from 14 September in New York, during a high-level summit, and needs ratification from 22 nations to become international law.
The Convention on the Suppression of Acts of Nuclear Terrorism is meant to stop clandestine networks from using or possessing nuclear weapons.
Its adoption capped seven years of negotiations since it was first introduced by Russia back in 1994.
It will oblige governments to prosecute or extradite individuals who possess radioactive materials or nuclear devices, or those who threaten others while possessing such materials.
The text also calls for exchanges of information and assistance among governments.
