Gibson had suggested helicopter surveys to determine the scale of looted sites.[25] By April 24, 2003, looting had taken place in Umma, Umm al-Hafriyat, Umm al-Aqarib, Bismaya, Larsa, and Bad-tibira, most of were unguarded.[26] Most looting was by workers once employed by the now disbanded State Board of Antiquities and Heritage.[25] A local tribe was guarding the World Heritage Site of Hatra although others were unsupervised.[26]