Intentionally using white phosphorus against civilians, can be construed as a war crime.[44] UN investigators collected evidence in order to investigate the claims. The Turkish Government denied it was a chemical attack, stating that they had no chemical weapons in their inventory. The situation was made worse for the wounded by the fact there were few medical centres left in Ras Al-Ain that could treat people.[45] The Organisation for the Prohibition of Chemical Weapons (OPCW) made moves to investigate the attack, but eventually did not start an investigation, stating that White Phosphorus is a heat based weapon rather than chemical, and so outside its remit.