In a statement posted online, the Kurdistan Freedom Falcons also warned tourists that Turkey was no longer secure for them.
"You are not our targets but Turkey is no longer safe for you," it read. "We have just started the war."
The Kurdistan Freedom Falcons is considered an offshoot of the Kurdistan Workers' Party, or PKK, and has carried out several attacks in the past.
It denounced the ruling Justice and Development Party, which was founded by President Recep Tayyip Erdogan, for its "wild war" against Kurds.
The rush hour car-bomb attack on Tuesday morning targeted a police vehicle in Istanbul and injured 36 people in addition to those killed.
Istanbul's bombing was followed on Wednesday by a suicide attack in the southeastern town of Midyat that killed three police officers and three civilians.
On Thursday, The PKK said the Midyat attack was carried out by one of its "comrades," code name Dirok Amed.
The authorities were quick to report they suspected Kurdish militants in both cases. The claims of responsibility confirmed those suspicions.
The PKK routinely attacks military and police targets in the southeast, where large-scale security operations to flush out Kurdish rebels have left hundreds dead, displaced entire communities and done extensive damage to urban infrastructure.
The PKK, labeled a terror organization by Turkey and its allies, is fighting for autonomy for Turkey's Kurds in the southeast. The decades-long conflict has claimed 40,000 lives.
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