ISTANBUL — Turkish fighter jets bombed Kurdish militants in northern Iraq on Tuesday, the military said, the fourth major airstrike in a month in what has become an extensive Turkish air campaign against the Kurdish fighters.

The military reported on its Web site that it “effectively hit” targets belonging to the Kurdistan Workers’ Party, or P.K.K., in the Zap, Avashin, Basyan and Hakurk regions. No casualties were reported.

The strike came as Gen. Ergin Saygun, the second in command of the Turkish military, visited Baghdad for talks on the Kurdish rebel group. General Saygun met with Iraqi officials and the top American commander, Gen. David H. Petraeus. They discussed “a range of military issues, as well as ways to establish cooperation in the struggle against terror,” according to the Turkish military.

The attack was part of a calculated campaign against the rebel group that began on Dec. 1, when Turkish soldiers shelled rebel positions in Iraqi territory.

At the time, the Turkish military and government were under tremendous public pressure to act against the group, which had carried out a humiliating ambush in October that killed 12 Turkish soldiers.

Reporting was contributed by Steven Lee Myers from Riyadh, Saudi Arabia; Abeer Mohammed, Stephen Farrell, Balen Y. Younis and Qais Mizher from Baghdad; and Iraqi employees of The New York Times from Baghdad, Diyala, Kirkuk and Sulaimaniya.

Copyright 2008 The New York Times Company