It was reported on Sunday that jets bombed Kurdish rebel targets in Iraq that day.
But the U.S. embassy in Ankara said there was no evidence of attack.
Turkish Foreign Minister didn’t give any comments, but noted that the U.S. officials would be informed about all cross-border operations.
More than 37,000 people have been killed in the conflict since the PKK launched an armed independence campaign in Turkey's southeast in 1984.
The PKK is listed as a terrorist organization internationally by a number of states and organizations, including the USA, NATO and the EU.
Malaysia needs Russia's assistance in maintaining and repairing Su-30MKM fighter jets
Japanese Prime Minister Shinzo Abe said that US army bases will not appear on the southern Kuril Islands in the even Russia delivers them to Japan
Posters for the play "Adam and Eve. Life after Paradise" with pictures of dancers Arsen Aghamalyan and Oksana Vasilyeva were banned in the city of Tver, Central Russia