Syrian activists say suspected U.S.-led airstrikes have killed 14 militants and five civilians in northeastern Syria.
The Britain-based Syrian Observatory for Human Rights said Thursday the overnight strikes hit the Deir el-Zour and Hassakeh areas.
On Wednesday, U.S. forces and those from Saudi Arabia and the United Arab Emirates conducted 13 airstrikes in eastern Syria as part of an operation against the Islamic State group.
U.S. Central Command, which oversees American military operations in the Middle East, said the attacks targeted small-scale oil refineries that generate up to $2 million per day for the militants.