From the Washington Times:

Turkish officials are warning NATO allies that they have detected new bases for the militant PKK Kurdish Workers Party being built in northern Iran, at least three in the Iranian city of Umriye disguised as medical facilities. The PKK have apparently relocated -- with Iranian permission -- after being driven out of northern Iraq last year by Turkish military raids. The Turks say they have evidence that the new camps are storing weapons and training insurgents -- and are dropping strong hints of an al Qaida connection.

As the story points out, such warnings are often prelude to a cross-border strike. The Turks have done this to Iraq in the past, under similar circumstances, but I'm not aware that they've ever gone after Iran. If they do, this could set up another flashpoint in the Middle East, whether Al Qaeda are involved or not.