If communist states stopped supporting acts of revolutionary terrorism or other states reined in their intelligence agencies in order to prevent terrorist acts, terrorist incidents would decrease dramatically. However, the U.N. conventions and resolutions are strengthening and widening international cooperation against terrorists. The International Civil Aviation Organization conventions against hijacking are becoming increasingly effective, and the hostage convention will further close the ring of international law against terrorism. Gaps remain in taking further precautions against nuclear terrorism and preparing to act should an emergency occur.