BAGHDAD (AP) — Drones targeted oil fields in Iraq’s semi-autonomous northern Kurdish region Wednesday, the latest in a series of attacks in recent days that have put several oil facilities out of commission.

A drone attack halted production at the Sarsang oilfield in Iraq’s Kurdistan region on Tuesday only hours before its U.S. operator signed a deal to develop another field.

Security sources point to regions controlled by Iran- backed militias as the origin of the drones.Explosive-laden drones struck three oil fields in Iraq's autonomous Kurdistan region early Wednesday,