Kurdish militants on Saturday said the conditions for maintaining a ceasefire with Turkey were no longer in place after Turkish warplanes bombed their stronghold in northern Iraq.

"The conditions for maintaining the ceasefire... have been eliminated," the People's Defence Forces (HPG), the military wing of the Kurdistan Workers Party (PKK) said in a statement, denouncing an "aggression of war" by Turkey and vowing "resistance".

Two two sides had until now largely observed a fragile ceasefire since 2013.