Turkish security sources have said "all signs" point to the so-called Islamic State being responsible for twin bombings in the Turkish capital Ankara.
Two senior sources told Reuters News their investigations were focused on IS, following similarities between the attack and a suicide bombing in July in the town of Suruc near the Syrian border.
One source, speaking on condition of anonymity, said: "This attack was in the style of Suruc and all the signs are that it was a copy of that attack ... the signs point to ISIL."
A second official said: "All signs indicate that the attack may have been carried out by ISIL. We are completely focused on ISIL."
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