Human rights defenders, environmentalists and political activists (25) Despite the State party’s affirmation that interim protection measures are adopted upon the request of human rights defenders, environmentalists and political activists who claim to be in danger, the Committee is concerned about reports of persisting acts of harassment and persecution, including threats, murders and other human rights violations, experienced by human rights defenders, environmentalists and other political activists, and about the fact that such acts go unpunished (art. 16). The State party should adopt effective measures to prevent and protect human rights defenders, environmentalists and other political activists from any further violence. Furthermore, the State party should ensure the prompt, thorough and effective investigation and appropriate punishment of such acts. Data collection (26) While noting that some statistics have been provided, the Committee regrets the lack of comprehensive and disaggregated data on complaints, investigations, prosecutions and convictions of cases of torture and ill-treatment by law enforcement officials, as well as on trafficking in persons and domestic and sexual violence. The Committee also regrets the lack of statistics in respect of inter-prisoner violence (arts. 12, 13 and 16). The State party should establish an effective system to gather all relevant statistical data in order to monitor the implementation of the Convention at national level, including complaints, investigations, prosecutions and convictions of cases of torture and ill-treatment, inter-prisoner violence, trafficking in persons and domestic and sexual violence. The Committee recognizes the implications in terms of confidentiality of gathering personal data and emphasizes that appropriate measures should be taken to ensure that there is no misuse of data collected. (27) The Committee invites the State party to ratify the principal United Nations human rights treaties to which it is not yet a party, namely the Optional Protocol to the Convention on the Rights of Persons with Disabilities, the Optional Protocol to the Convention on the Elimination of All Forms of Discrimination against Women and the Optional Protocol to the Covenant on Economic, Social and Cultural Rights. (28) The Committee invites the State party to submit its core document in accordance with the requirements for the preparation of a common core document established in the harmonized reporting guidelines approved by the international human rights treaty bodies and contained in document HRI/GEN/2/Rev.5. (29) The Committee recommends that the State party consider making the declarations under articles 21 and 22 of the Convention. (30) The State party is encouraged to disseminate widely its report submitted to the Committee and the Committee’s concluding observations, through official websites, the media and non-governmental organizations. (31) The Committee requests the State party to provide, within one year, information on its response to the Committee’s recommendations contained in paragraphs 9, 11, 13, 14, 18 and 19 above. (32) The State party is invited to submit its second periodic report by no later than 15 May 2013. 49. Israel (1) The Committee considered the fourth periodic report of Israel (CAT/C/ISR/4) at its 878th and 881st meetings (CAT/C/SR.878 and 881), held on 5 and 6 May 2009, and adopted, at its 893rd meeting (CAT/C/SR.893), the following concluding observations. A. Introduction (2) The Committee welcomes the submission of the fourth periodic report of Israel, which is in conformity with the Committee’s guidelines for reporting. 94