The Turkish military rained bombs on suspected hideouts of the outlawed Kurdistan Workers Party (PKK) in Iraqi Kurdistan early Tuesday, hitting ammunition depots, caves and other hideouts, Turkey’s National Defense Ministry announced in a statement. More than 20 aircraft took part in the sorties, which hit 28 separate targets in the Asos mountain range along the Iranian border. The attacks mark a further expansion of Turkey’s ongoing offensive against the rebels well beyond the areas bordering Turkey and moving 200 kilometers (124 miles) deep into Iraqi territory.

The mayor of Penjwin, a nearby district scarred by Iraq’s long war with Iran, said the strikes commenced at around 6:30 a.m. local time and continued for around 20 minutes. He told the local news outlet Rudaw that Turkish drones likely carried out the attacks. He said that not much damage had been inflicted but that local farmers had been scared.

Last week Turkey attacked a Yazidi militia known as the Sinjar Resistance Units (YBS) which has close ties to the PKK in the Yazidi-dominated Sinjar area bordering Syria. A senior YBS leader perished in the strike that was followed by another on a makeshift clinic where YBS militants were being treated. At least eight people, four of them civilians, died as a result of that attack.

Turkey has carried out previous operations in Sulaimaniyah province, where Asos is located, most recently in June. But most of its activity is focused along the mountainous areas bordering Turkey and the Bradost region where the Turkish, Iraqi and Iranian borders converge. Numerous civilians caught in the middle have died. The latest such victims were two Iraqi Arabs who strayed into the Batufa area of Zakho across from Turkey. The men identified as Ahmet Shakir Mahmoud, 40, and Yusuf Omar, 20, died when a drone hit the car they were traveling in.