A woman affected by what activists say was a gas attack on the town of Telminnes is transferred to Bab al-Hawa hospital, which is close to the Turkish border, to receive treatment April 21, 2014. Chlorine gas attacks in Syria this month, if proven, expose a major loophole in an international deal which promised to remove chemical weapons from Syria and suggest chemical warfare could persist after the removal operation has finished. In addition, chlorine gas that was never included on the list submitted to the OPCW is now allegedly being used on the battlefield, leading some countries to consider requesting an investigation, possibly through the United Nations. On Monday, opposition groups reported a further attack, this time 20 miles (30 km) northeast of Kfar Zeita in the town of Telminnes. Picture taken April 21, 2014. REUTERS/Amer Alfaj (SYRIA – Tags: POLITICS CIVIL UNREST CONFLICT)