CRC/C/15/Add.137 page 6 and places of detention for children, teachers, health personnel, including psychologists, and social workers. Technical assistance from, inter alia, the Office of the High Commissioner for Human Rights and UNICEF could be requested in this regard. 2. General principles Non-discrimination 32. Concern is expressed at the existing patterns of economic and social disparity, and of gender and racial discrimination; at the marginalization of children belonging to the Afro-Colombian and indigenous populations; and at the precarious situation of children belonging to internally displaced populations, especially regarding their limited access to housing, education and health services. 33. In the light of article 2 and other related articles of the Convention, the Committee recommends that the State party increase measures to reduce economic and social disparities, including between urban and rural areas; to prevent discrimination against the most disadvantaged groups of children, such as girls, children with disabilities, children belonging to indigenous and ethnic groups, children living in and/or working on the streets, children living in camps for internally displaced populations and children living in rural areas; and to guarantee their full enjoyment of all the rights recognized in the Convention. The right to life, survival and development 34. In the light of article 6 and other related provisions of the Convention, the Committee is deeply concerned at the threat posed by the armed conflict to children’s lives, including instances of extrajudicial killing, disappearance and torture committed by the police and paramilitary groups; at the multiple instances of “social cleansing” of street children; and at the persistent impunity of the perpetrators of such crimes. 35. The Committee reiterates its recommendation that the State party continue taking effective measures to protect children from the negative effects of the armed conflict. The Committee urges the State party to protect children against “social cleansing” and to ensure that judicial action be taken against the perpetrators of such crimes. 3. Civil rights and freedoms Birth registration 36. While the Committee notes the State party’s efforts in the area of birth registration, it remains concerned that greater efforts are needed to ensure that all children are registered and are provided with identity cards in order to facilitate the full enjoyment of their rights. 37. In the light of article 7 of the Convention, the Committee recommends that the State party continue its measures to ensure the immediate registration of the birth of all