The 2005 United Nations International Convention for the Suppression of Acts of Nuclear Terrorism (Nuclear Terrorism Convention) is a multilateral treaty open to the ratification of all states designed to criminalize acts of nuclear terrorism and to promote police and judicial cooperation to prevent, investigate and punish those acts. It covers a broad range of acts and possible targets, including nuclear power plants and nuclear reactors; covers threats and attempts to commit such crimes or to participate in them, as an accomplice; stipulates that offenders shall be either extradited or prosecuted; encourages States to cooperate in preventing terrorist attacks by sharing information and assisting each other in connection with criminal investigations and extradition proceedings; and, deals with both crisis situations, assisting States to solve the situations and post-crisis situations by rendering nuclear material safe through the International Atomic Energy Agency (IAEA).
Source: Wikipedia