The United Nations Assistance Mission in Iraq (UNAMI) condemned the attack on the Kormor gas field.
The United Nations Assistance Mission in Iraq (UNAMI) says "We condemn the attack on the Kormor gas field, which supplies electricity to the Kurdistan Region.
"We extend our condolences to the families of the dead and wish a speedy recovery to the injured," it said.
"We welcome an investigation to identify the perpetrators and prosecute them," it said.
Four Yemeni workers were killed and two others wounded in a drone attack on the Kormor gas field in Chamchamal district on Friday evening.