Jabbar Yawir, a spokesman for the Iraqi Kurdish security forces, said no casualties were reported.
The military launched a major ground offensive across the border in February, signalling a new phase in the conflict between Turkey and the PKK.
The PKK took up arms against the Turkish state in 1984 with the aim of establishing an ethnic homeland in mainly Kurdish southeast Turkey.
About 40,000 people have been killed in the conflict.
The European Union and the United States are keen for fellow Nato-member Turkey to keep its attacks in northern Iraq limited to avoid destabilising Iraq and the wider region.
The EU, US and Turkey say they consider the PKK a "terrorist" organisation.