Speaking on Turkish television, Ahmet Davutoglu said that Islamic State was the focus of investigations into the twin suicide bombing which were an attempt to influence the outcome of parliamentary elections next month.
He added that investigators were close to identifying one of the suspected bombers.
The pro-Kurdish Peoples' Democratic Party (HDP), which said it was targeted in the attack, has put the death toll at 128, and suggested it may cancel further rallies ahead of the 1 November poll.
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