The Gulf Cooperation Council (GCC) has urged Yemeni President Ali Abdullah Saleh to sign a power transfer plan as forces loyal to the Yemeni president attacked pro-opposition troops.According to Saudi Press agency, the GCC said in a statement that group want to see Saleh immediately sign the initiative and ensure a peaceful transition of power to meet people's aspirations for change and reform.Meanwhile, reports say that more than 40 people have been killed since Friday in clashes as unarmed protesters fled in panic. The president's main military rival, Gen. Ali Mohsen Al-Ahmar has called on Gulf and Western powers to stop Yemeni President from igniting a civil war.