The joint Polish-Ukrainian team spent the week surveying several hundred square metres of land.
While they did not find the mass grave believed to hold around 70 bodies, researchers discovered the remains of a chapel and a single burial, which may be linked to the killings.
"We searched all the indicated sites thoroughly," said Professor Andrzej Ossowski of the Pomeranian Medical University in Szczecin, who leads the Polish side of the project.
"We did not find the mass grave, but we found individual remains – a single skeleton that we can connect to this event."
The team will now apply for permission to exhume the remains and continue searching for the main grave.
The excavations are funded by Poland's Ministry of Culture and National Heritage, with the Ukrainian side represented by a municipal enterprise of the Lviv Regional Council.
The village of Uhly was attacked on 12 May 1943 by a unit of the Ukrainian Insurgent Army, known by its acronym UPA.
More than 100 Polish residents are estimated to have been killed and around 50 homesteads burned.
The killings were among a series of atrocities known in Poland as the Volhynia Massacres.
Polish historians estimate that about 100,000 Poles were killed by the UPA and associated nationalist formations from 1943 to 1945 in what was then Nazi-occupied eastern Poland and is now western Ukraine.
The legacy of the wartime violence remains a sensitive issue in relations between Poland and Ukraine, with differing interpretations of the role of the Organisation of Ukrainian Nationalists (OUN) and the UPA.
Poland regards the killings as genocide, while many in Ukraine view the conflict as a broader wartime struggle involving violence on both sides and emphasise the groups’ later resistance to Soviet rule.
The Volhynia region, which was within Poland's borders prior to World War II, was first occupied by the Soviets in 1939, and then by the Nazi Germans in 1941.
A moratorium on searches for the remains of Polish victims on Ukrainian territory, in place since 2017, was lifted in late November 2024, following a joint announcement by the Polish and Ukrainian foreign ministers.
(ał)
Source: PAP, IAR