At midnight on Monday al-Shabab Somali militants killed 36 non-Muslims after separating them from Muslim workers. The victims were captured while sleeping in their tents at a quarry in Kormey. al-Shabab carried out the attack because of the presence of Kenyan forces in Somalia. There is growing concern in Kenya about security in regions bordering Somalia after a spate of similar attacks. Borders with Somalia and Ethiopia are dominated by largely Muslim Somalis. Many of those killed came from the south of Kenya where Christians predominate. These attacks affect the economy and social make-up of the region as most of its workers - skilled and unskilled - are non-Muslim Kenyans. Many Christians, including nurses and teachers, fled the area after a bus attack last week.  A presidential adviser has warned that al-Shabab is trying to fan a religious war. Christian leaders have publicly accused Muslim leaders of not doing enough to tame radicalism within their ranks.