https://twitter.com/MattBroomfield1/status/15092064663512760...
Source on PKK targeting non-paramilitary/police/military civilians in the last 20 years?
e: I can find this from 1987 (a time when the Turkish state was also actively involved in massacring civilians) https://en.wikipedia.org/wiki/P%C4%B1narc%C4%B1k_massacre
* December 2016 Istanbul car bombing / suicide bombing near a football stadium, killing 44 people
* October 2016 Istanbul bombing - injuring 10 civilians
* June 2016 Istanbul bombing / killing 6 civilians
* March 2016 Ankara car bombing killing 37 people
* June 2006 Manavgat (in the province Antalya, a popular region for tourists) detonation of a bomb in a tourist site, killing four people
Sources:
https://en.wikipedia.org/wiki/October_2016_Istanbul_bombing
TAK != PKK, TAK claimed responsibility. 39 of those killed were police officers. Turkish military also kills civilians while targeting opposing militia groups.
> * June 2014 Istanbul bombing / killing 6 civilians
Link? Did this happen?
> March 2016 Ankara car bombing
TAK not PKK, again.
> * June 2006 Manavgat
Yet again, TAK.
> https://en.wikipedia.org/wiki/October_2016_Istanbul_bombing
Not intentional targeting civilians, accidental premature explosion of bomb. Only one of the attacks you've mentioned that was by the actual PKK and actually killed civilians. (e: actually no civilians killed)