Armed Kurdish fighters from the Kurdistan Workers Party (PKK) stand at attention after arriving in the Heror region of Iraq, northwest of Baghdad, on Tuesday, May 14, 2013. (AP Photo/Ceerwan Aziz)

Photo by: Ceerwan Aziz

Armed Kurdish fighters from the Kurdistan Workers Party (PKK) stand at attention after arriving in the Heror region of Iraq, northwest of Baghdad, on Tuesday, May 14, 2013. (AP Photo/Ceerwan Aziz)