Is There Any Evidence That the YPG Set Off a Bomb in a Marketplace?

Turkey has been dribbling out more and more information at first they immediately jumped to conclusions but it looks like these are Syrian Kurds that are involved. Turkey is insisting that these people are connected in one way or the other. We're unlikely to get any real light on this and in some ways it doesn't matter because Erdogan has been on the war path now for a long time about this whole issue.