The Turkish government said on Saturday that its forces had killed 15 Kurdish women fighters during clashes in the majority-Kurd province of Bitlis.
The guerillas were members of the separatist PKK, which is battling for Kurdish autonomy and has a number of female units.
The death toll is believed to be the largest for women in a single day since the group began its struggle 28 years ago. Dogan news agency said that fighting had continued "all day Friday."
A government-paid village guard who helped the Turkish army was also reportedly killed.
The incident came after a week of fighting between the army and the PKK, in which at least seven Turkish soldiers and 24 rebels have lost their lives.
Tensions have risen following a Turkish clampdown on Kurds attempting to celebrate the Nowruz, or new year, festival.
As Aslef's annual assembly of delegates begins in Edinburgh tomorrow the general secretary explains the challenges his members - and workers across the country - face