Carnage in Ankara - by whom and why?

This is the second time in the past five months that Turkey's capital has been hit by terrorist carnage. The first one was in October 2015, when Islamic State of Iraq and the Levant (ISIL) suicide bombers killed 101 civilians in front of the main train station. On Feb. 17, another suicide bomber, this time in a vehicle loaded with hundreds of kilograms of explosives, killed 28 people, most of them military personnel heading home in a bus. Moreover, this second attack took place in the most official spot of the all-official Ankara: right next to the Chief of Staff and the headquarters of the Army and the Navy.

But who is responsible for this attack? ISIL, of course, is always a usual suspect, but this time the culprits seem to be of a different genre. The police soon identified the suicide bomber as Salih Muhammed Neccar, a 24-year-old Syrian Kurd, who entered Turkey in the summer of 2014 from the besieged city of Kobane. His background and profile shows no affiliation with ISIL, but does show affiliation with the Democratic Union Party (PYD), the main Kurdish party in Syria. 

Hence the Turkish government declared the PYD as the culprit of the horrible attack. This, of course, seems to justify Ankara's aversion to the PYD, and the recent shelling of PYD targets in northern Syria by the Turkish military. It also gives Ankara the right to call on its allies, such as the United States, to stop seeing the PYD as an ally in Syria.

However, there is also the fact that the PYD denied any responsibility for the attack. Salih Muslim, the leader of the party, spoke just an hour after Prime Minister Ahmet Davuto?lu's accusation of the PYD, and said they had "nothing to do with what happened in Ankara."

Meanwhile, however, Cemil Bay?k, the...