Turkey points blame at Kurdish militants after terror attack targeting military

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Turkey blamed Kurdish militant groups at home and in neighboring Syria on Thursday for a deadly suicide bombing in Ankara and vowed strong retaliation for the attack -- a development that threatens to further complicate the escalating Syrian civil war.

The leader of a Kurdish umbrella organization -- which includes the Kurdistan Workers' Party, or PKK -- did not rule out the possibility that rogue Kurdish militants, angered by Turkish military operations in the country's southeast, may have been behind the attack Wednesday that targeted buses carrying military members.

"Previously such acts have been carried out in retaliation for massacres in Kurdistan. It is possible that those who did it will soon explain why they did it," Cemil Bayik told the pro-Kurdish Firat News.

The U.S. State Department was in "no position" to confirm who was responsible, spokesman John Kirby said.

Also Thursday, six soldiers were killed in southeastern Turkey after PKK members detonated a bomb on a road linking the cities of Diyarbakir and Bingol as a military vehicle was passing by, the state-run Anadolu Agency reported.

The rush hour car-bomb attack on Wednesday evening killed 28 people and injured dozens of others as Turkey grapples with an array of issues, including renewed fighting with the Kurdish rebels, the threat from Islamic State militants and the Syria refugee crisis. The blast was the second deadly bombing in Ankara in four months.

Prime Minister Ahmet Davutoglu told reporters that a Syrian national with links to Syrian Kurdish militia carried out the attack in collaboration with the PKK. Davutoglu also accused Syria's government of responsibility for allegedly backing the Syrian Kurdish militia.

"It has been determined with certainty that this attack was carried out by members of the separatist terror organization together with a member of the YPG who infiltrated from Syria," Davutoglu said, identifying the bomber as Syrian national Salih Neccar, born in 1992.

The Ankara attack came as Turkey had been pressing the U.S. to cut off support to the Kurdish Syrian militias, which Turkey regards as terrorists because of their affiliation with the PKK. The U.S. already lists the PKK as a terror group. But Washington relies heavily on the Syrian Democratic Union Party, or PYD, and its military wing, the People's Protection Units, or YPG, in the battle against the Islamic State group and has rejected Turkish pressure.

The political arm of the YPG on Thursday denied involvement in the Ankara bombing. "We are completely refuting that... Davutoglu is preparing for something else because they are shelling us as you know for the past week," Saleh Muslim, the co-leader of the YPG’s political wing, told Reuters.

At least 14 people were arrested since Wednesday in connection with the attacks, President Recep Tayyip Erdogan said, adding that the numbers of suspects detained was likely to increase.

Erdogan insisted evidence obtained by the Turkish authorities pointed to the YPG.

"Despite the fact that their leader says they have nothing to do with this, the information and documents obtained by our Interior Ministry and all our intelligence organizations shows that (the attack) was theirs," Erdogan said.

Turkish artillery has been shelling PYD and YPG positions along its border in Syria, apparently concerned by a series of recent gains by the militias in the area.

Turkey has said its shelling is a response to hostile fire coming across its border, a claim the YPG also denied.

"I can assure you not even one bullet is fired by the YPG into Turkey... They don't consider Turkey an enemy," Muslim told Reuters.

Erdogan said the attack would show the international community the strong links that exist between the PKK and the Syrian Kurdish militias.

But any Turkish escalation against the PYD is likely to further strain ties with the U.S.

"Those who directly or indirectly back an organization that is the enemy of Turkey, risk losing the title of being a friend of Turkey," Davutoglu said in an apparent reference to Washington. "It is out of the question for us to excuse a terror organization that threatens the capital of our country."

Paul T. Levin, head of the Stockholm University Institute for Turkish Studies, told the AP: "it will be interesting to see how the United States reacts because they view the YPG as an ally ... Will they (the United States) shift their view on YPG?"

Turkey has also been helping efforts led by the U.S. to combat the Islamic State group in neighboring Syria, and has faced several deadly bombings in the last year that were blamed on ISIS.

The Syrian war is raging along Turkey's southern border. Recent airstrikes by Russian and Syrian forces have prompted tens of thousands of Syrian refugees to flee to Turkey's border.

Turkey's military, meanwhile, said its jets conducted cross-border raids against Kurdish rebel positions in northern Iraq, hours after the Ankara attack, striking at a group of about 60-70 PKK rebels. The Turkish jets attacked PKK positions in northern Iraq's Haftanin region, hitting the group of rebels which it said included a number of senior PKK leaders, the military said. The claim couldn't be verified.

Turkey's air force has been striking PKK positions in northern Iraq since a fragile two-and-a-half year-old peace process with the group collapsed in July, reigniting a fierce three-decade old conflict.

In October, suicide bombings blamed on ISIS targeted a peace rally outside the main train station in Ankara, killing 102 people in Turkey's deadliest attack in years.

The Associated Press contributed to this report.