An explosion at a police checkpoint Friday in Cizre, Turkey, killed 11 people and wounded 70, state-run news agency Anadolu reports.

Of those injured, four are in critical condition, Turkish Health Minister Recep Akdag said on CNN Turk.

Anadolu reported earlier that eight police officers were killed in the attack, which took place in the southeastern province of Sirnak.

There has been no claim of responsibility for the attack yet.

The Sirnak governor's office told Anadolu they blame the PKK -- a militant Kurdish group that's labeled a terror group by many in the international community. It said a car bomb was detonated at the police checkpoint.

The blast comes two days after Turkish tanks entered northern Syria to help Syrian rebels clear ISIS from a border town.

(CNN)