The PKK rebels, also known as KADEK, have been fighting for an ethnic homeland in southeastern Turkey since 1984. More than 30,000 people have died in the conflict, though violence largely subsided after the 1999 capture of rebel leader Abdullah Ocalan.

"It is announced that the unilateral cease-fire has come to an end as of September 1 and that the cease-fire can only continue bilaterally," KADEK was quoted as saying in a statement issued by the Europe-based Mezopotamya News Agency.

Any resurgence of the rebellion in the southeast could have implications for Turkey's bid to join the European Union. EU members criticized Turkish military operations during the 1980s and 1990s, raising accusations of torture and other human rights abuses.

KADEK had previously threatened to end the cease-fire at the start of September if Turkey did not respond to its truce calls.