Police in northern Greece on Monday arrested two foreign nationals, aged 24 and 19, and charged them with people smuggling after a car chase.
The two suspects had 10 illegal migrants crammed in their car, police said.
The migrants had entered Greece via the country's border with Turkey in the Evros region.
The Greek Council for Refugees has filed a complaint with the Supreme Court in Athens over claims of violent pushbacks at the northeastern Evros border with Turkey.
In an announcement on Wednesday, the GCR said that its complaint includes a file of evidence supporting the claims of several migrants and asylum seekers who said they were forced back over the border into Turkey.
A 36-year-old man was arrested on Wednesday after police found 12 migrants squeezed in a car he was driving in northern Greece, state-run news agency ANA-MPA reported.
Officers who saw the vehicle on a section of the Egnatia highway north of Thessaloniki, signaled to the driver to stop but the man sped up to avoid the inspection.
Turkish President Recep Tayyip Erdogan's recent comments confirm fears that diplomatic niceties are not enough to smooth the path of Greek-Turkish relations. They confirm that Greece basically does not have someone to talk to on the other side, a person with which it can build a relationship of trust in the conventional manner.
Unionists representing farmers in Nikaia, central Greece, have accused the government of launching a "political persecution" after 10 of their colleagues were summoned by a Larissa prosecutor on charges of obstructing public transport.
Hundreds of farmers have parked their tractors along one lane of the Athens-Thessaloniki national highway at the Nikaia junction in Farsala.
A Hellenic Air Force officer and a British national who were detained on Sunday after allegedly taking photographs of military installations in a restricted area near the Evros border with Turkey will remain in police custody in the town of Orestiada until they appear before an investigative magistrate Wednesday, according to reports Tuesday.