The United Nations Human Rights Committee is a treaty body composed of 18 experts, established by a 1966 human rights treaty, the International Covenant on Civil and Political Rights (ICCPR). The Committee meets for three four-week sessions per year to consider the periodic reports submitted by the 173 States parties to the ICCPR on their compliance with the treaty, and any individual petitions concerning the 116 States parties to the ICCPR's First Optional Protocol. The Committee is one of ten UN human rights treaty bodies, each responsible for overseeing the implementation of a particular treaty.