the law), and article 18 (freedom of thought, conscience and religion). The rights enshrined in these provisions are non-derogable by the very fact that they are listed in article 4, paragraph 2. The same applies, in relation to States that are parties to the Second Optional Protocol to the Covenant, aiming at the abolition of the death penalty, as prescribed in article 6 of that Protocol. Conceptually, the qualification of a Covenant provision as a non-derogable one does not mean that no limitations or restrictions would ever be justified. The reference in article 4, paragraph 2, to article 18, a provision that includes a specific clause on restrictions in its paragraph 3, demonstrates that the permissibility of restrictions is independent of the issue of derogability. Even in times of most serious public emergencies, States that interfere with the freedom to manifest one’s religion or belief must justify their actions by referring to the requirements specified in article 18, paragraph 3. On several occasions the Committee has expressed its concern about rights that are nonderogable according to article 4, paragraph 2, being either derogated from or under a risk of derogation owing to inadequacies in the legal regime of the State party.4 8. According to article 4, paragraph 1, one of the conditions for the justifiability of any derogation from the Covenant is that the measures taken do not involve discrimination solely on the ground of race, colour, sex, language, religion or social origin. Even though article 26 or the other Covenant provisions related to nondiscrimination (articles 2, 3, 14, paragraph 1, 23, paragraph 4, 24, paragraph 1, and 25) have not been listed among the non-derogable provisions in article 4, paragraph 2, there are elements or dimensions of the right to non-discrimination that cannot be derogated from in any circumstances. In particular, this provision of article 4, paragraph 1, must be complied with if any distinctions between persons are made when resorting to measures that derogate from the Covenant. 9. Furthermore, article 4, paragraph 1, requires that no measure derogating from the provisions of the Covenant may be inconsistent with the State party’s other obligations under international law, particularly the rules of international humanitarian law. Article 4 of the Covenant cannot be read as justification for derogation from the Covenant if such derogation would entail a breach of the State’s other international obligations, whether based on treaty or general international law. This is reflected also in article 5, paragraph 2, of the Covenant according to which there shall be no restriction upon or derogation from any fundamental rights recognized in other instruments on the pretext that the Covenant does not recognize such rights or that it recognizes them to a lesser extent. 10. Although it is not the function of the Human Rights Committee to review the conduct of a State party under other treaties, in exercising its functions under the Covenant the Committee has the competence to take a State party’s other international obligations into account when it considers whether the Covenant allows the State party to derogate from specific provisions of the Covenant. Therefore, when invoking article 4, paragraph 1, or when reporting under article 40 on the legal framework related to emergencies, States parties should present information on their other international obligations relevant for the protection of the rights in question, in particular those obligations that are applicable in times of emergency.5 In this respect, States parties should duly take into account the developments within international law as to human rights standards applicable in emergency situations. 6 103