CAT/C/LKA/CO/3-4 gender, ethnicity, age, geographical region and type and location of place of deprivation of liberty, including data on complaints, investigations and prosecutions of cases of torture and ill-treatment by law enforcement officials, military and prison personnel, and on enforced disappearances, rape and violence against women. 32. Noting the voluntary commitments made by the State party in the context of the universal periodic review of the Human Rights Council in May 2008 (A/HRC/8/46, paras. 90 and 108-110) the Committee recommends that the State party consider adopting the draft bill on witness and victim protection and the draft bill on the rights of internally displaced persons; improve and upgrade detention facilities; and, improve the capacity of police in carrying out investigations, with additional training in interrogation and prosecution. 33. The Committee recommends that the State party consider ratifying the Optional Protocol to the Convention. 34. The Committee recommends that the State party consider making the declarations under articles 21 and 22 of the Convention. 35. The Committee invites the State party to consider ratifying the core United Nations human rights treaties to which it is not yet a party. 36. The State party is encouraged to disseminate widely the reports submitted by Sri Lanka to the Committee and these concluding observations, in appropriate languages, through official websites, the media and non-governmental organizations. 37. The State party is invited to update its common core document (HRI/CORE/LKA/2008), in accordance with the requirements of the common core document contained in the harmonized guidelines on reporting under the international human rights treaties (HRI/GEN.2/Rev.6). 38. The Committee requests the State party to provide, by 25 November 2012, followup information in response to the Committee’s recommendations related to (1) ensuring or strengthening legal safeguards for persons detained, (2) conducting, prompt, impartial and effective investigations, and (3) prosecuting suspects and sanctioning perpetrators of torture or ill-treatment, as contained in paragraphs 7, 11, 18 and 21 of the present document. In addition, the Committee requests follow-up information on remedies and redress to the victims addressed in those paragraphs. 39. The State party is invited to submit its next report, which will be the fifth periodic report, by 25 November 2015. To that purpose, the Committee invites the State party to accept, by 25 November 2012, to report under its optional reporting procedure, consisting in the transmittal, by the Committee to the State party, of a list of issues prior to the submission of the periodic report. The State party's response to this list of issues will constitute, under article 19 of the Convention, its next periodic report. 14