Several oilfields operated by foreign companies in Iraq’s semi-autonomous region of Kurdistan have halted production in the past few hours following attacks with explosive-laden drones on infrastructure at the fields. A drone attack forced the suspension of production at the Sarsang oilfield, operated by a U.S. privately held firm, HKN Energy. The attack took place hours before HKN Energy signed a preliminary agreement with the Iraqi oil ministry to develop another oilfield.