The Beijing Convention and Protocol further criminalise the act of using civil aircraft as a weapon, and of using dangerous materials to attack aircraft or targets on the ground. The treaties criminalise the unlawful transport by aircraft of biological, chemical and nuclear weapons and their related material. They also provide for the criminal liability of those who direct and organise such conduct, and for criminal liability in certain circumstances in respect of threats and attempts. The treaties also update provisions to promote cooperation between States in combating the unlawful acts directed against civil aviation while emphasising the human rights and fair treatment of the suspects. The Beijing Convention and Protocol are similar to the existing Suppression of Unlawful Acts Protocols, which apply in the maritime context.