A/HRC/4/48 page 20 97. Demobilized children from illegal armed groups reported to the Ombudsman’s Office that they had been put under pressure by the security forces to provide information, participate in operations and identify members of the groups to which they belonged, all of which is incompatible with the prohibition of the use of children in military and intelligence activities.19 98. The Procurator General’s Office and the Ombudsman’s Office have reiterated the need to include measures to prevent displacement in operations by the security forces such as combat activity or spraying of illegal crops.20 99. The OHCHR office noted substantial efforts by the air force and the marines to take into account the risks to protected persons in the planning and execution of military operations. VI. ACTIVITIES OF THE OFFICE IN COLOMBIA 100. The OHCHR through its regional branches in Bogotá, Cali, Medellín and Bucaramanga, continued to carry out its mandate of observing the situation of human rights and IHL in Colombia; monitoring public policies; providing advice and technical cooperation, working jointly with the authorities, civil society and the international community; and disseminating the relevant international norms and principles. Annex III contains a more detailed description of these activities. 101. In 2006, 2,138 complaints were received, of which 1,772 were selected for follow-up. The Office informed the authorities of several of these complaints. During the same period, 259 observation missions were carried out, for a total of 633 days of field visits. 102. The Office intensified its dialogue with the authorities and established two mechanisms for joint work at the highest government and state level, for the purpose of exchanging information and contributing to the strengthening of capacities to improve the human rights situation and work on the causes that generate the main violations and thus eradicate them. In carrying out its advisory function, the Office worked permanently with the Government, the judicial branch, the control organs and members of the legislature. It also worked with representatives of NGOs and other sectors of civil society, the international community and the United Nations system in Colombia. 103. The advisory and technical cooperation activities were geared, in particular, towards strengthening the capacity of Colombian institutions, both public institutions and those of civil society. Noteworthy in 2006 was the work carried out by the Vice-President’s office to follow up the recommendations made by the High Commissioner in her most recent report. By means of a cooperation project, the OHCHR Office monitored the formulation of the National Plan of 19 20 Op. cit., footnote 15 above, p. 64. Constitutional Court decision No. 218, and sixth report of the Procurator General on the observance of the rulings of the Constitutional Court (judgement T-025 and orders 176-178, 218 and 266).