A Kurdish militant group has claimed responsibility for a car bomb attack in the Turkish capital Ankara which killed 28 people.

In a statement posted on its website, the Kurdistan Freedom Falcons, said Friday it carried out the attack to avenge Turkish military operations against Kurdish rebels in southeast Turkey. The Turkey-based group is an offshoot of the Kurdistan Workers' Party, or PKK.

Turkey had blamed a U.S.-backed Syrian Kurdish militia group for the attack, saying they had acted in collaboration with the PKK.