Drone and rocket strikes killed nine members of an Iranian Kurdish armed opposition group in Iraq's Kurdistan region on Friday, the exiled party said, blaming the attack on Iran.
In Erbil, the capital of Kurdistan, the US-led anti-jihadist coalition shot down several drones in the second such incident in the city this week.
The attacks, which the Kurdish government also blamed on Tehran, come against the backdrop of renewed military escalation between the United States and Iran, Iraq's main allies.
During the Middle East war, the Kurdistan region, which hosts US troops and foreign oil companies as well as exiled Iranian Kurdish rebels , has been a target for attacks carried out by Iran and pro-Iran Iraqi armed groups.
Idriss Kohlwazi from the exiled Komala Party of Iranian Kurdistan told AFP : "The Iranian regime attacked at 04:30 am (0130 GMT) with drones and rockets a camp."
The strikes killed nine members of the party at their camp near the city of Sulaimaniyah, he said.
Later, a strike hit another camp belonging to Kurdish rebels, wounding two fighters, according to Komala's Amjad Panahi.
Even after a ceasefire was announced in April, Iran continued to strike Kurdish opposition groups, which Tehran accuses of serving both Western and Israeli interests.
But Friday's attack marked the biggest escalation, with these groups having mostly evacuated their bases and camps since the war.
Iranian attacks
In Erbil, Kurdish counterterrorism forces said that "coalition forces downed eight explosive-laden drones over Erbil between 04:19 and 05:25 am (0119 and 0225 GMT)" on Friday, with no damage or casualties reported.
Erbil is home to a major US consulate complex and its airport houses military advisers attached to the US-led coalition.
Separately, a strike hit a weapon warehouse belonging to Kurdish forces in northern Iraq on Friday, a Kurdish military source said.
"A missile hit a Peshmerga arms depot in the town of Tasluja," which is near Sulaimaniyah, the official told AFP , speaking on condition of anonymity because he is not allowed to speak to the media.
The strike caused a huge fire in the area, but no casualties were reported, he said.
The prime minister of Iraq's autonomous Kurdistan region on Friday denounced "the unjustified attacks by the Islamic Republic of Iran against the Kurdistan region".
Masrour Barzani's office said that "while urging the Islamic Republic of Iran to stop this escalation, we also call on the Iraqi federal government and the international community to end these violations."
On Wednesday evening, the coalition also shot down eight drones over Erbil, with AFP journalists reporting that the drones were hit by air defences near the US consulate, which was a primary target of attacks during the regional war.
No group has claimed responsibility for any attacks in Erbil.
During the Middle East war, pro-Iran armed groups, operating under the umbrella of the Islamic Resistance in Iraq, targeted US facilities in Iraq more than 600 times in support of Tehran.