But she said her panel had not yet seen any evidence of Syrian government forces using chemical weapons, according to the BBC, but she added that more investigation was needed.
Syrian rebels used Sarin nerve gas, not Assad's regime: U.N. official →
"Accountability for these and other crimes must form part of any political solution," Commissioner Carla del Ponte said. "Instead, these violations are being committed with total impunity."
U.N. report: Syrian government torturing, killing thousands of civilian detainees →