In his House Foreign Affairs Committee hearing, US envoy Jim Jeffrey said the US is looking into allegations of war crimes in Syria.

He said the US sent packages and "a high-level demarche” to Ankara, Turkey to discuss the war crimes the US has seen committed by Turkish-supported opposition (TSO).

He also elaborated on those incidents, saying they involved the killing of Kurdish politician Havrin Khalaf and “the killing of several people who are defenseless with their hands tied.”

"We’re looking into that now. We immediately reached out to Ankara and asked for the highest level explanation of this and we’re not going to give up on that. But that’s the incident that we’re all focusing on right now, there haven’t been a lot of them," Jeffrey said.