According to Abou Jeng and other scholars, the Barre regime rule was marked by a targeted brutal persecution of the Isaaq clan. Mohamed Haji Ingiriis and Chris Mullin state that the clampdown by the Barre regime against the Hargeisa-based Somali National Movement targeted the Isaaq clan, to which most members of the SNM belonged. They refer to the clampdown as the Isaaq genocide or Hargeisa holocaust. A United Nations investigation concluded that the crime of genocide was "conceived, planned and perpetrated by the Somali Government against the Isaaq people". The number of civilian casualties is estimated to be between 50,000-100,000 according to various sources, while some reports estimate the total civilian deaths to be upwards of 200,000 Isaaq civilians. Along with the deaths, Barre regime bombarded and razed the second and third largest cities in Somalia, Hargeisa and Burao respectively. This displaced an estimated 400,000 local residents to Hartasheikh in Ethiopia; another 400,000 individuals were also internally displaced. The counterinsurgency by the Barre regime against the SNM targeted the rebel group's civilian base of support, escalating into a genocidal onslaught against the Isaaq clan. This led to anarchy and violent campaigns by fragmented militias, which then wrested power at a local level. The Barre regime's persecution was not limited to the Isaaq, as it targeted other clans such as the Hawiye. The Barre regime collapsed in January 1991. Thereafter, as the political situation in Somaliland stabilized, the displaced people returned to their homes, the militias were demobilized or incorporated into the army, and tens of thousands of houses and businesses were reconstructed from rubble. Although the SNM at its inception had a unionist constitution, it eventually began to pursue independence, looking to secede from the rest of Somalia. Under the leadership of Abdirahman Ahmed Ali Tuur, the local administration declared the northwestern Somali territories independent at a conference held in Burao between 27 April 1991 and 15 May 1991. Tuur then became the newly established Somaliland polity's first President, but subsequently renounced the separatist platform in 1994 and began instead to publicly seek and advocate reconciliation with the rest of Somalia under a power-sharing federal system of governance. Muhammad Haji Ibrahim Egal was appointed as Tuur's successor in 1993 by the Grand Conference of National Reconciliation in Borama, which met for four months, leading to a gradual improvement in security, as well as a consolidation of the new territory.