CRC/C/MMR/CO/3-4 (e) Take measures to prevent that children deprived of liberty in police stations or in detention facilities are kept with adults, and that girls are kept with boys, and to ensure that they have a safe, child-sensitive environment, and that they maintain regular contact with their families; (f) Make use of the technical assistance tools developed by the Interagency Panel on Juvenile Justice and its members, including UNODC, UNICEF, OHCHR and NGOs and seek technical assistance in the area of juvenile justice from members of the Panel. Child victims and witnesses of crimes 95. The Committee recommends that the State party ensure, through adequate legal provisions and regulations, that all children victims and/or witnesses of crimes, e.g. children victims of abuse, domestic violence, sexual and economic exploitation and trafficking, are provided with the protection required by the Convention and that it take fully into account the Guidelines on Justice in Matters Involving Child Victims and Witnesses of Crime. Children belonging to minority or indigenous groups 96. The Committee reiterates its concern (CRC/C/15/Add.237, para. 27) that children belonging to ethnic, indigenous, religious and other minority groups, in particular Rohingya children, face multiple restrictions and forms of discrimination and continue to be denied access to basic rights, including the right to food, health care, education, survival and development, as well as the right to enjoy their culture and to be protected from discrimination. 97. The Committee recalls its previous concluding observations (CRC/C/15/Add.237) and urges the State party to gather additional information on all ethnic minorities and other marginalized groups and to elaborate policies and programmes to fully ensure the implementation of their rights without discrimination. The Committee recommends in particular that the State party take effective measures to improve access to education and primary health care for children in the northern Rakhine State. The Committee also recommends that the State party take into account the Committee’s general comment No. 11 (2009) on indigenous children and their rights under the Convention. I. Ratification of international human rights instruments 98. In order to further strengthen the fulfilment of children’s rights, the Committee urges the State party to ratify all the core United Nations human rights treaties and their Optional Protocols, namely the: (a) Optional Protocol to the Convention on the Rights of the Child on the involvement of children in armed conflict; (b) International Convention on the Elimination of All Forms of Racial Discrimination; (c) International Covenant on Economic, Social and Cultural Rights and its Optional Protocol; (d) Protocols; International Covenant on Civil and Political Rights and its Optional 23