Greece's anti-terrorism service raided three apartments in central Athens on Nov. 28, detaining nine people for questioning on suspected of links to a far-leftist militant group outlawed in Turkey, police said.
So far nine people have been detained, they are all Turkish citizens of Kurdish origin based on their identity papers, while one of the detainees is a woman, according to latest information.
Police found jars containing unspecified explosive material, cables to connect to detonators and laptops.
Authorities are probing links to DHKP-C, an outlawed group blamed for attacks and suicide bombings in Turkey.
The operation is ongoing.
Turkish President Tayyip Erdoğan is expected to visit Greece in December.