A PKK spokesman claimed nobody was hurt.
At least eight planes carried out the operation against the PKK militants from about 1630 GMT, the sources said, adding the bombing had been intense.
There was no announcement from Turkey's General Staff, which on Thursday said its warplanes had fired on a group of militants in northern Iraq the day before as they tried to cross into Turkey.
Clashes also continued inside Turkey on Friday and the General Staff said two soldiers had been killed in the mountainous province of Sirnak, which borders Iraq. Military sources said one was a major and the other a soldier.
"We have fighters in the area but they are not concentrated in a single place. This is why we do not have any casualties," PKK spokesman Ahmed Danees told Reuters by telephone in northern Iraq.
The Turkish military staged an eight-day incursion into northern Iraq in February against the PKK, which uses the neighbouring country as a base from which to launch attacks on Turkey.
The United States and the European Union, along with Turkey, consider the PKK a terrorist organisation.
Last Mod: 26 Nisan 2008, 18:25