ANKARA, Turkey (AP) — In a sign of further turbulence for the U.S. led-coalition against the Islamic State group, Turkish warplanes have struck suspected Kurdish rebel positions in southeastern Turkey, media reports said Tuesday.

It was the first major airstrikes against the Kurdistan Workers’ Party, or PKK, since peace talks began two years ago to end a 30-year insurgency in Turkey. It added to tensions between the key U.S. coalition partner and PKK, a militant group listed as a terrorist organization by the U.S. that is also among the fiercest opponents of the Islamic State group.