Turkey Authorizes Warships To Escort Gaza Aid

[Marauder06]

Suspected Bomb Rocks Turkish Capital

Not good.

So many different places this could have come from.

Just reading the headline, I'd suspect Kurds. But as you said, there are a lot of other likely suspects as well.

 

[JBS]

Interesting quote:

The parked car was purchased a week ago but it was not yet registered. Police detained a woman at the scene who shouted "long live our struggle!" as she was escorted away by police, Dogan news agency video showed.

And of course there was a recent dragnet in the South a couple days ago, in which over 95 (suspected) PKK were taken in:
http://www.english.rfi.fr/europe/20110917-turkey-arrests-95-kurds-over-alleged-pkk-links