Apparently there was a bomb blast in the centre of Mersin near the vicinity of the following building:
No casualties were reported and I’ve only heard of the blast from two web reports: ‘Explosion shakes Turkey, no casualties‘ and ‘Bomb Explodes In Southern Turkey, No Casualties‘. I don’t know how the first article gets the idea that the explosion shook Turkey.
When I go home I will have a look at the local TV channels and see what actually happened.