Iraqi Prime Minister Ali Faleh al-Zaidi on Monday ordered a joint investigation into the drone attack that halted production at the Khor Mor gas field, one of Iraq's major gas-producing sites.

The prime minister ordered the formation of a joint investigative committee with the authorities in the Kurdistan Region of Iraq, according to the security media office of the commander-in-chief. Initial reports indicated there were no casualties, the office said.

Production at the field in Al-Sulaymaniyah province was halted on Sunday after a drone attack targeted the site, two security sources told Reuters. Smoke was seen rising from the field after the strike.

An engineer working at the field said a gas storage facility was hit during the attack, and all crew were ordered to go into shelters for fear of further attacks, Reuters reported. A local security source said the attack was carried out by a drone and halted production at the field.

Khor Mor is one of Iraq's major gas-producing fields and one of the largest in the Kurdistan region. It is operated by Pearl Petroleum, a consortium that includes UAE-based Dana Gas and other partners, and is a key supplier of gas used to fuel power plants across the Kurdistan region.

The halt in production raises questions about power supplies in the region, where the field's gas feeds electricity generation. The field provides supplies for regional power generation, and any extended outage would put pressure on the power plants that depend on its gas.

Neither the prime minister's office nor the sources cited in the reports named a suspect behind the attack or gave a date for production to resume. The investigation will need to establish who carried out the strike, how the gas storage facility was hit, and what is needed to bring the field back into operation safely.

The joint committee brings Baghdad and Erbil together to establish the circumstances of the attack on a facility that sits at the centre of the Kurdistan region's energy supply. The involvement of both the federal government and the Kurdistan regional authorities reflects the field's importance to the whole of Iraq's gas and power system.

The order was announced on Monday morning, hours after the Sunday attack, through the security media office of the commander-in-chief, which said the committee would work jointly with the Kurdistan regional authorities.

No further details of the investigation's scope or timetable were announced. The prime minister's office said only that the committee had been ordered and that initial reports indicated no casualties from the attack.