In a statement posted on its website, the Kurdistan Freedom Falcons said it carried out the attack to avenge Turkish military operations against Kurdish rebels in southeast Turkey. The Turkey-based group is considered an offshoot of the Kurdistan Workers' Party, or PKK, and has carried out several violent attacks in the past.
Turkey had blamed a U.S.-backed Syrian Kurdish militia group for the attack, saying they had acted in collaboration with the PKK.
Prime Minister Ahmet Davutoglu had identified the bomber as Syrian national Salih Neccar and said he was a member of the Syrian Kurdish militia group People's Protection Units, or YPG.
The YPG, however, has been most effective in the fight against the Islamic State group in Syria.
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The Kurdistan Freedom Falcons, also known as TAK, however, named the bomber as Abdulbaki Sonmez.
"This act was conducted to avenge the massacre of defenseless, injured civilians," the group said, in reference to a large-scale Turkish security operation against militants in the town of Cizre. Rights groups have raised serious concerns over the operation in the town, which has been placed under a curfew that prevents journalists and observers from entering.
Today, Turkish authorities said they had detained three more suspects in connection with the bombing in Ankara, raising the number of people in custody to 17, the state-run Anadolu Agency said. The latest suspects are believed to be linked to the PKK, it said.
Turkey's military pushed ahead with its cross-border artillery shelling campaign against YPG positions in Syria, Anadolu reported.
Erdogan said today that Turkish authorities don't have the slightest doubt that the YPG and its political arm, the Democratic Union Party, or PYD, were behind the bombing and said Turkey was saddened by its Western allies' failure to brand them as terrorist groups.