CRC/C/HND/CO/3 page 22 (c) Improve the conditions of detention of children when detention is used as a last resort, notably by complying with the international standards as to surface area, ventilation, fresh air, natural and artificial light, proper food, drinking water and hygienic conditions; (d) Establish an independent child-sensitive and accessible system for the reception and processing of complaints by children and investigate, prosecute and punish any case of mistreatment or abuse committed; (e) Ensure that children deprived of their liberty remain in regular contact with their families while in the juvenile justice system, notably by informing parents when the child is detained; (f) Provide training for penitentiary staff on children’s rights and special needs; (g) Request technical assistance in the area of juvenile justice and police training from, inter alia, the United Nations Interagency Panel on Juvenile Justice, which includes the United Nations Office on Drugs and Crime, UNICEF, OHCHR and NGOs. 82. The Committee reiterates its previous recommendation that the State party bring the system of juvenile justice fully in line with the Convention, in particular with articles 37, 40 and 39, and with other United Nations standards in the field of juvenile justice, such as: the United Nations Standard Minimum Rules for the Administration of Juvenile Justice (the “Beijing Rules”); the United Nations Guidelines for the Prevention of Juvenile Delinquency (the “Riyadh Guidelines”); the United Nations Rules for the Protection of Juveniles Deprived of their Liberty (the “Havana Rules”); and the Committee’s general comment No. 10 on Children’s Rights in Juvenile Justice (CRC/C/GC/10). Children belonging to indigenous groups 83. The Committee notes with concern that indigenous communities continue to face serious difficulties in the enjoyment of the rights enshrined in article 30. In particular, the Committee is concerned that the enjoyment of the rights by children belonging to indigenous groups is negatively affected by the following: (a) High level of poverty, inadequate access to basic services, health and education and high rates of illiteracy; (b) Systematic threats and abuses against indigenous communities and impunity of the perpetrators; (c) Land usurpation from municipal corporations and destruction of natural resources. 84. The Committee recommends that the State party pursue measures to address effectively the gap in life opportunities of indigenous children, and take adequate measures in order to provide protection for the rights of indigenous children taking into due account the recommendations adopted by the Committee on its Day of General Discussion on the rights of indigenous children in September 2003.