Skeletal remains of more than 25 people, including children, were uncovered in woodland.
The skeletons, of men, women and young children who were shot dead by Nazi troops, were discovered in Warsaw, Poland.
The mass grave was pointed out by an elderly resident who said Nazis were in the area when he was a child during WW2.
The Institute of National Remembrance followed the tip-off and made the gruesome discovery.
Tomasz Trzaska from the Institute said: "The remains of several dozen people, including women and children, were discovered in a mass grave.
"The current state of work allows us to conclude that the remains of at least 25 people were buried at the discovered site.
"Information about this place was given to us by a witness who, as a small child, saw and remembered that the Germans led several people to this place.
"He was a few years old at the time, 7, maybe 8. Our historians investigated and confirmed this supposition.
"On Monday we started preparations, secured the site. On Tuesday we made the find."
Over the past few days, the number of skeletal remains has increased to 29.
The bodies had been arranged together indicating the soldiers forced the victims to lie in the death pits before killing them, the Institute said.
Clothing, buttons, belts and shoes were also found among the remains.
Documents released by the Central Archives of Modern Records said the execution likely took place in 1943 as secret reports confirm mass killing in the area at that time.
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A report from Poland's WWII resistance reads: "On 3 July in the morning, four vehicles brought about 100 people, including several women, to the forest between Choszczówka and Legionowo.
"They were ordered to dig ditches, then all of them were shot."
The find will be examined in the hope to identify who the victims were.
It's estimated that nearly six million Polish civilians were killed during WW2.
Over 90% were non-military victims when forces invaded the country in 1939, and the Soviets invaded two weeks afterwards.
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