GENEVA (Reuters) – The N’t has reports of Islamic State (ISIL) executing people thought to be cooperating with rebel fighters in Deir al-Zor governorate in eastern Syria, the U.N. human rights boss said on Wednesday.

Michelle Bachelet, talking with a news conference in Geneva, voiced deep concern for 7,000 civilians who she said were trapped between Islamic State fighters preventing them from leaving Deir al-Zor and air strikes by a U.S.-led coalition.

"We also have reports of ISIL executing people considered cooperating with SDF (Syrian Democratic Forces) as well as other parties into the conflict," she said, adding that civilians were used as "pawns and bargaining chips" within the conflict.