86 6. The Committee shall hold closed meetings when examining communications under this article. 7. The Committee shall forward its views to the State Party concerned and to the individual. 8. The provisions of this article shall come into force when five States Parties to this Convention have made declarations under paragraph 1 of this article. Such declarations shall be deposited by the States Parties with the Secretary-General of the United Nations, who shall transmit copies thereof to the other States Parties. A declaration may be withdrawn at any time by notification to the Secretary-General. Such a withdrawal shall not prejudice the consideration of any matter which is the subject of a communication already transmitted under this article; no further communication by or on behalf of an individual shall be received under this article after the notification of withdrawal of the declaration has been received by the SecretaryGeneral, unless the State Party has made a new declaration. Article 23 The members of the Committee and of the ad hoc conciliation commissions which may be appointed under article 21, paragraph I (e), shall be entitled to the facilities, privileges and immunities of experts on mission for the United Nations as laid down in the relevant sections of the Convention on the Privileges and Immunities of the United Nations. Article 24 The Committee shall submit an annual report on its activities under this Convention to the States Parties and to the General Assembly of the United Nations. PART III Article 25 1. This Convention is open for signature by all States. 2. This Convention is subject to ratification. Instruments of ratification shall be deposited with the Secretary-General of the United Nations. Article 26 This Convention is open to accession by all States. Accession shall be effected by the deposit of an instrument of accession with the SecretaryGeneral of the United Nations. Article 27 1. This Convention shall enter into force on the thirtieth day after the date of the deposit with the Secretary-General of the United Nations of the twentieth instrument of ratification or accession. 2. For each State ratifying this Convention or acceding to it after the deposit of the twentieth instrument of ratification or accession, the Convention shall enter into force onthe thirtieth day after the date of the deposit of its own instrument of ratification or accession. Article 28 1. Each State may, at the time of signature or ratification of this Convention or accession thereto, declare that it does not recognize the competence of the Committee provided for in article 20. 2. Any State Party having made a reservation in accordance with paragraph I of this article may, at any time, withdraw this reservation by notification to the Secretary-General of the United Nations.