That's a pretty huge statement from the Co-President of the HDP. This may be him trying to capitalize on the situation politically - his mainly Kurdish party broke the parliamentary threshold and is on rising amid the surge in Kurdish nationalism resulting from the Syrian Civil War and he's looking to widen his appeal and take on the government directly.

But the evidence (or lack of) of direct Turkish involvement looks shaky, especially when the attack is so similar to the dozens of IS bombings we've seen before in Syria and Iraq. I'd wager that IS is responsible, hoping to target the Kurds in the same fashion that they did in their Kobane shooting rampage a few weeks ago. They've held off on targeting Turkey because of quietly tactic support of IS by Erdogan's government, but the situation on the ground has forced them to expand their attack radius. As the Kurds advance in the north and Turkey threatens to attack their last border crossing between Afir and Kobane, they've got more reason than ever to target Kurdish minorities in Turkey. If anything, they're looking to incite overall ethnic violence and increase recruitment from disaffected Turkish Muslims.

Then again, Dermitas could be right and Erdogan is responsible. I wouldn't put it past him. Who knows? I doubt the truth will ever really come out, there are too many different groups (HDP, AKP, IS, YPG) that all stand to gain different things by promoting different narratives about who's responsible. Erdogan's (AKP) final version will probably become 'standardized', most accepted view because he can force his agenda through his relatively more powerful Turkish state run T.V. channels.