Three women whose bodies were found on the Greek side of Evros River were stabbed to death, the coroner said in a preliminary findings on Wednesday.
The coroner said their death, from stab wounds in the neck, occurred within the last two days. They carried no identification papers but he said they appear to be migrants or refugees.
Two of them, he said, were between 15 and 18 years old.
The victims appeared to be of North African, Middle Eastern or Asian origin, but their nationalities and identities were unknown, police said.
Their bodies were transported to Alexandroupoli for an autopsy, while the police has begun investigations in the triple killing. DNA tests were planned to determine whether the three were related.
Police said a farmer found the victims on the Greek side of the river Evros, which runs between Greece and Turkey, east of the town of Didymoteicho. The Evros area is known as an entry point for migrants trying to enter Greece illegally by land.
Greek officials said the number of people arrested at the land border with Turkey so far this year was about double the total figure for 2017, although the sea route to the eastern Aegean Sea islands remains more popular.