A/HRC/10/13 page 15 detention, and a campaign of assassinations of civilian officials - are the main factors that induced them to leave their homes. These abuses occur in an environment of total impunity and collapse of law and order. While some aid does reach IDPs, Somalia has this year witnessed the highest number of killings and kidnappings of aid workers in the world. To address the causes of displacement, improve humanitarian access, and provide the space for durable solutions, the international community must engage much more seriously in establishing mechanisms that could end the violence and hold the parties to this conflict accountable for their actions. B. Working visits and follow-up activities 48. The Representative also conducted working visits to Bosnia and Herzegovina, Colombia, Kenya, Madagascar, Mozambique, Sri Lanka and Timor-Leste to follow up on previous official visits and/or advise on specific issues. 1. Bosnia and Herzegovina 49. The Representative undertook a working visit to Bosnia and Herzegovina from 16 to 20 June 2008 at the invitation of the Minister for Human Rights and Refugees, following up on his official mission in June 2005. The aim of the visit was to make recommendations in the context of the ongoing review of the strategy for implementation of annex VII to the General Framework Agreement for Peace in Bosnia and Herzegovina (Dayton Peace Agreement) regarding solutions to the problems faced by refugees and displaced persons, including their return. 50. The Representative notes with satisfaction the Bosnian Government’s many recent efforts to assist the displaced population, particularly given the decline in the attention of the international community. However he was dismayed to see, 13 years after the war, that many people remained displaced or in impoverished conditions in “temporary” sites established for returnees. He is also concerned about the lack of sustainability of many returns. 51. The Representative recommends that the Bosnian Government take urgent action to resolve the 8,000 pending humanitarian cases. It should locally integrate the most vulnerable, who languish in community centres or other forms of temporary accommodation and remain unable to return, and help them to re-establish decent living conditions. The success of the return process should be measured by the real opportunities available to the returnees, especially those belonging to minority groups, to rebuild their lives and reintegrate into society in their places of origin in sustainable ways. 2. Colombia 52. At the Government’s invitation, the Representative visited Colombia from 9 to 15 November 2008 to assess developments since his official mission in 2006. 53. The Representative observed that Colombia continues to experience a severe displacement crisis, despite positive action by State authorities. He noted with appreciation the important role of the Constitutional Court in promoting and protecting the human rights of IDPs. In particular, in a series of decisions over the past four years, the Constitutional Court has launched a process that draws together the Government, international actors and civil society to jointly strengthen