The Khor Mor gas field, belonging to UAE energy firm Dana Gas in Sulaymaniyah in the Iraqi Kurdistan region was hit by a Katyusha rocket, the second such incident this week. 

The Friday attack targeted an employee housing unit of the facilities and local television broadcasts showed a column of rising smoke near the field with sirens sounding, but there was no immediate word on possible casualties from the attack.

According to Sulaymaniyah's counter-terrorism service, a Katyusha rocket also landed inside Khor Mor --one of the biggest gas fields in Iraq -- on Wednesday but caused no damage. 

On Thursday, Dana Gas said that normal operations continued at Khor Mor. 

No group has claimed responsibility for either attack but armed groups that some Iraqi officials say are backed by the Islamic Republic have claimed similar attacks in the past.

In March, Iran fired missiles at Erbil, the capital of Iraqi Kurdistan. No one was killed but missiles did damage to some residential buildings. Iran claimed it used 12 ballistic missiles in that attack and targeted an Israeli intelligence center.

Iraqi Foreign Minister Fuad Hussein said earlier this month that Baghdad had submitted a formal complaint to Iran for its aggressive behaviors toward Iraq and the Kurdistan Autonomous Region, and denied Iran's allegations that the Israeli Mossad is present in Erbil, stressing that Iran must refrain from attacks on the capital of Iraqi Kurdistan.