Syrian government media and rebel forces said that poison gas had been used in a central village, injuring scores of people, while blaming each other for the attack.
Videos have emerged purporting to show a hospital room in Kfar Zeita that was packed with men and children, some of whom breathing through oxygen masks.
On one bed, the video showed six children on a bed, some appearing to have difficulty breathing while others cried.
Euronews can not independently verify the authenticity of the footage.
State-run Syrian television blamed members of the al-Queda linked Nusra Front for using chlorine gas in the village of Kfar Zeita in the central province of Hama killing two people and injuring more than 100.
Meanwhile experts on board a chemical weapons destroyer ship docked in southern Spain are ready to start working on Syria’s toxic arms stock in the middle of the Mediterranean as early as May.
The Syrian government agreed to hand over its stockpile under an international deal backed by Washington and Moscow. The weapons include precursors for deadly nerve agents sulphur, mustard and sarin gas.