The grim discovery was made after builders stumbled upon human remains during work at the site in Mikołajki in the Warmian-Maurian Voivodeship.
The grim discovery thought to date back to the Bronze Age was made in the village of Tuchola Żarska after local schoolchildren began digging around with a bucket and spade.
The 75 victims buried today, which include three infants, were discovered during archaeological work carried out earlier this year by a special section of Poland’s Institute of National Remembrance.
The oldest human remains in Poland are over 100,000 years old. They are bones from a hand belonging to a young Neanderthal child, which were digested by a large bird. The remains were found in Jaskinia Ciemna (cave), in southern Poland.