The Kurdistan Freedom Falcons, or TAK, says that two members of its "revenge team" died in the Jan. 5 Izmir attack, according to a news agency close to Kurdish militants.
Firat News Agency, quoting a statement by the group Wednesday, identified the attackers as "comrades" Mustafa Coban and Enes Yildirim, aged 29 and 25 respectively.
TAK threatened "new acts of revenge" against the "fascist" Turkish state, which is fighting Kurdish rebels in the southeast.
The two assailants were shot dead after they detonated an explosives-laden vehicle at a roadblock and engaged in a shootout with police.
The PKK has waged a decades-long insurgency and is considered a terror organization by Turkey and its allies, including the US.
TAK has claimed multiple attacks in the past year, including two bombings that killed 45 people near a soccer stadium in Istanbul last month.