"For some time, we have been receiving intelligence information based from some (Kurdish rebel) and Daesh statements that certain suicide attackers would be sent to Turkey... and that through these attackers chaos would be created in Turkey," Davutoglu told reporters, using the IS group's Arabic acronym.
"The (Kurdish rebels) or Daesh could emerge (as culprits) of today's terror event," Davutoglu said, promising that those behind the attacks would be caught and punished.
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Critics have accused Erdogan of re-igniting the fighting with the Kurds to seek electoral gains — hoping that the turmoil would rally voters back to the ruling Justice and Development Party, or AKP. Electoral gains by the country's pro-Kurdish party caused the AKP, founded by Erdogan, to lose its parliamentary majority in a June election after a decade of single-party rule.
Erdogan denies the accusation.
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"This attack (Saturday) resembles and is a continuation of the Diyarbakir and Suruc (attacks)," said Selahattin Demirtas, leader of the Turkey's pro-Kurdish party. "We are faced with a huge massacre."
He held Erdogan and Davutoglu's government responsible for the latest attack, saying it was "carried out by the state against the people."
In the aftermath of the Ankara attack, the PKK declared a temporary cease-fire. A rebel statement said Saturday the group is halting hostilities to allow the Nov. 1 election to proceed safely. It said it would not launch attacks but would defend itself.
The government has previously dismissed any possible Kurdish cease-fire plans, saying the rebels must lay down their arms and leave the Turkish territory.