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.

The strike came a day after other explosive-laden drone attacks were reported elsewhere in Kurdistan, including at an airport. No one has claimed responsibility.